Home › CAT › Quantitative Aptitude › Time, Speed and Distance › A car covers the first 60 km at 30 km/h and the …
A car covers the first 60 km at 30 km/h and the next 60 km at 60 km/h. What is the average speed for the whole journey?
A$40$ km/h
B$45$ km/h
C$48$ km/h
D$50$ km/h
Answer & Solution
Correct answer: A. $40$ km/h
Total distance = 120 km. Time on first leg = 60/30 = 2 h. Time on second leg = 60/60 = 1 h. Total time = 3 h. Average speed = 120/3 = 40 km/h. (Simple average 45 km/h is the trap.)
Related questions
The first step in a distance, rate and time problem, after reading it, is to:Hamilton drove 40 mph in the city and in the desert he drove:Hamilton's rate in the desert was how many times his rate in the city?Hamilton left home at 2:00 pm and entered the desert at 4:30 pm, so he drove in the city fHamilton's trip to Las Vegas from Orange County covers:Katie Mae's home is how far from her school?If Katie Mae walks at 3 mph and bikes 3 mph faster, her biking speed is:Katie Mae is 3 mph faster on her bike than on foot. Her walking speed is: