alleryA car 240 km behind another chases it at 80 km/h while the leader goes 60 km/h. Time to catch up?
- 6 hours
- 10 hours
- 8 hours
- 12 hours
Show answer and solution
Correct answer: D. 12 hours
The gap shrinks at 20 km/h, so 240 / 20 = 12 hours.
RRB NTPC Time, Speed and Distance — practice questions — page 2
Explore 68 free Time, Speed and Distance questions in RRB NTPC Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–60 of 68.
A car 240 km behind another chases it at 80 km/h while the leader goes 60 km/h. Time to catch up?Read the answer and worked solution →A 180 m train at 54 km/h overtakes a jogger running at 18 km/h the same way. How long to pass the jogger?Read the answer and worked solution →The same 180 m train at 54 km/h meets a jogger running toward it at 18 km/h. Time to pass him?Read the answer and worked solution →A boat moves at 12 km/h in still water and the stream flows at 3 km/h. What is its downstream speed?Read the answer and worked solution →A boat makes 18 km/h downstream and 10 km/h upstream. Its speed in still water is?Read the answer and worked solution →With downstream speed 18 km/h and upstream speed 10 km/h, how fast does the river flow?Read the answer and worked solution →A boat of still-water speed 8 km/h goes 30 km with a 2 km/h current. How long is the trip downstream?Read the answer and worked solution →The same boat (8 km/h still water, 2 km/h current) now covers 30 km against the current. How long does it take?Read the answer and worked solution →A rower goes 24 km with the current in 2 hours and comes back in 3 hours. What is the current's speed?Read the answer and worked solution →A boat with still-water speed 15 km/h goes 40 km downstream and returns, with the current at 5 km/h. Total time?Read the answer and worked solution →A cyclist on a 2 km circular path rides steadily at 8 km/h. How long is one lap?Read the answer and worked solution →Two vehicles cover the same distance with speeds in the ratio 3:4. What is the ratio of the times they take?Read the answer and worked solution →By what percentage is the time for a fixed journey cut if speed rises by 25%?Read the answer and worked solution →If the speed on a fixed route falls by 20%, by what percentage does the travel time rise?Read the answer and worked solution →At 30 km/h a student reaches school 5 minutes late and at 40 km/h 5 minutes early. How far is the school?Read the answer and worked solution →Walking at three fourths of his usual speed, a man reaches the office 20 minutes late. What is his usual time?Read the answer and worked solution →At five sixths of her normal pace a woman is 15 minutes late. How long does the trip normally take?Read the answer and worked solution →A vehicle covers two fifths of a 10 km road at 20 km/h and the rest at 30 km/h. Average speed?Read the answer and worked solution →Raising a car's speed by 5 km/h lets it finish a 60 km route 1 hour sooner. What was its original speed?Read the answer and worked solution →A truck slowed by 6 km/h takes 1 extra hour on a 72 km route. What was its original speed?Read the answer and worked solution →A hiker covers 3 km in 45 minutes. What is the speed in km/h?Read the answer and worked solution →A plane flies 1,800 km in 2.5 hours. What is its speed?Read the answer and worked solution →At 12 km/h, how many minutes does a walker need for 3 km?Read the answer and worked solution →Sound travels at 340 m/s in air. What is this in km/h?Read the answer and worked solution →A person walks at 6 km/h. How many metres does he cover each minute?Read the answer and worked solution →In a 100 m race A needs 20 s and B needs 25 s. How far behind is B when A finishes?Read the answer and worked solution →In a 1000 m race A runs at 10 m/s and wins by 100 m. How fast does B run?Read the answer and worked solution →A car goes from P to Q, 120 km, at 60 km/h and returns at 40 km/h. Total time for the round trip?Read the answer and worked solution →A lorry drives 1 hour at 40 km/h and then 2 hours at 70 km/h. How far does it go in all?Read the answer and worked solution →A ship sails at 20 knots for one hour. How many kilometres does it cover?Read the answer and worked solution →
Worked practice questions
A 180 m train at 54 km/h overtakes a jogger running at 18 km/h the same way. How long to pass the jogger?
- 15 seconds
- 18 seconds
- 12 seconds
- 20 seconds
Show answer and solution
Correct answer: B. 18 seconds
Relative speed 36 km/h = 10 m/s, and 180 / 10 = 18 seconds.
The same 180 m train at 54 km/h meets a jogger running toward it at 18 km/h. Time to pass him?
- 12 seconds
- 10 seconds
- 8 seconds
- 9 seconds
Show answer and solution
Correct answer: D. 9 seconds
Relative speed 72 km/h = 20 m/s, so 180 / 20 = 9 seconds.
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