Quantitative Aptitude • Time, Speed & WorkMedium
A boat moves at 8 km/h in still water and the stream flows at 4 km/h. How long will the boat take to go 24 km downstream and come back?
A. 2 hours
B. 9 hours
C. 8 hours✓ Correct Answer
D. 6 hours
💡 Solution & Explanation
Downstream the stream helps: 8 + 4 = 12 km/h, so going takes 24 ÷ 12 = 2 hours. Upstream the stream works against it: 8 − 4 = 4 km/h, so coming back takes 24 ÷ 4 = 6 hours. Total time = 8 hours.
More Quantitative Aptitude Time, Speed & Work questions
- Pipes A and B can fill a tank in 4 hours and 6 hours respectively, and pipe C can empty the full tank in 12…
- A boat moves at 5 km/h in still water and the stream flows at 1 km/h. How long will the boat take to go 24 km…
- Pipe A can fill a tank in 6 hours and pipe B can empty the full tank in 12 hours. If both pipes are opened…
- A train 1070 m long is running at 216 km/h. How long will it take to cross a platform 490 m long?
- A boat moves at 6 km/h in still water and the stream flows at 1 km/h. How long will the boat take to go 35 km…