alleryStart learning →Convert a speed of $90$ km/hr into metres per second.
- $18$ m/s
- $22.5$ m/s
- $25$ m/s
- $27$ m/s
Show answer and solution
Correct answer: C. $25$ m/s
Multiply km/hr by $\dfrac{5}{18}$: $90 \times \dfrac{5}{18} = 25$ m/s.
IIFT Boats and Streams — practice questions
Explore 41 free Boats and Streams questions in IIFT Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
Practise Boats and Streams with Quill →Boats and Streams questions and exercises with answers
Showing questions 1–30 of 41.
Convert a speed of $90$ km/hr into metres per second.Read the answer and worked solution →A car covers $360$ km in $4$ hours. Find its average speed.Read the answer and worked solution →A man travels the first half of a journey at $30$ km/hr and the second half at $60$ km/hr. Find his average speed for the whole journey.Read the answer and worked solution →If the ratio of the speeds of A and B is $3 : 4$, what is the ratio of the times they take to cover the same distance?Read the answer and worked solution →Convert 72 km/h to m/s.Read the answer and worked solution →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?Read the answer and worked solution →A bus travels equal distances at 40 km/h and 60 km/h. What is the average speed for the whole journey?Read the answer and worked solution →A 150-metre train at 54 km/h crosses a stationary pole. How long does it take?Read the answer and worked solution →A 200-metre train at 36 km/h crosses a 100-metre platform. How long does it take?Read the answer and worked solution →A boat covers 24 km downstream in 2 hours and the same 24 km upstream in 3 hours. What is the speed of the stream?Read the answer and worked solution →A car that usually takes 6 hours for a trip now takes 4 hours due to a higher speed. By what factor did the speed increase?Read the answer and worked solution →Pipe A fills a tank in 8 hours; Pipe B fills it in 12 hours. How long do both pipes take together?Read the answer and worked solution →A driver increases his speed by 25%. By what percentage does the journey time decrease (for the same distance)?Read the answer and worked solution →Complete the idea of a percentageRead the answer and worked solution →Ratios into percentagesRead the answer and worked solution →Order the steps of the unitary methodRead the answer and worked solution →What is the percentage taken OF?Read the answer and worked solution →True or false: percentages and their baseRead the answer and worked solution →Match each comparison to its formRead the answer and worked solution →Common percentage conversionsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every correct way to express one quarterRead the answer and worked solution →Flip and pair: fraction with percentageRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: the unitary methodRead the answer and worked solution →Ratio, fraction, or percentage?Read the answer and worked solution →Complete the comparison chainRead the answer and worked solution →Percentage of a quantityRead the answer and worked solution →
Worked practice questions
A car covers $360$ km in $4$ hours. Find its average speed.
- $60$ km/hr
- $80$ km/hr
- $90$ km/hr
- $100$ km/hr
Show answer and solution
Correct answer: C. $90$ km/hr
Speed $= \dfrac{\text{Distance}}{\text{Time}} = \dfrac{360}{4} = 90$ km/hr.
A man travels the first half of a journey at $30$ km/hr and the second half at $60$ km/hr. Find his average speed for the whole journey.
- $35$ km/hr
- $40$ km/hr
- $45$ km/hr
- $50$ km/hr
Show answer and solution
Correct answer: B. $40$ km/hr
For equal distances, average speed is the harmonic mean: $\dfrac{2xy}{x+y} = \dfrac{2 \times 30 \times 60}{90} = \dfrac{3600}{90} = 40$ km/hr.
Not the arithmetic mean $(30 + 60)/2 = 45$ — that holds for equal *times*, not equal *distances*.
How to practise
- Choose a Boats and Streams question and try to work out your answer.
- Open the question to check the correct answer and read its worked solution.
- Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.