Quantitative Aptitude • Time, Speed & WorkMedium
A boat moves at 7 km/h in still water and the stream flows at 3 km/h. How long will the boat take to go 40 km downstream and come back?
A. 4 hours
B. 14 hours✓ Correct Answer
C. 11.43 hours
D. 10 hours
💡 Solution & Explanation
Downstream the stream helps: 7 + 3 = 10 km/h, so going takes 40 ÷ 10 = 4 hours. Upstream the stream works against it: 7 − 3 = 4 km/h, so coming back takes 40 ÷ 4 = 10 hours. Total time = 14 hours.
More Quantitative Aptitude Time, Speed & Work questions
- A train 150 m long is running at 108 km/h. How long will it take to cross a platform 180 m long?
- A can finish a piece of work in 18 days and B can finish it in 36 days. How many days will they take working…
- A cyclist goes from one town to another at 20 km/h and comes back by the same road at 30 km/h. What is the…
- A cyclist goes from one town to another at 48 km/h and comes back by the same road at 72 km/h. What is the…
- A train 260 m long crosses a pole in 13 seconds. What is the speed of the train in km/h?