Question

The speed of a boat in still water is 15 km/h, and the speed of the current is 5 km/h. In how much time (in hours) will the boat travel a distance of 60 km upstream and the same distance downstream?

• A. 20
• B. 12
• C. 9
• D. 10

Answer 1

Answer:

C. 9

Speed of boat in upstream = 15 – 5 = 10 km/h Speed of boat in downstream = 15 + 5 = 20 km/h Time taken by boat to travel 60 km upstream = 60/10 = 6 hours Time taken by boat to travel 60 km downstream = 60/20 = 3 hours Time taken by boat to travel a distance of 60 km upstream and the same distance downstream = 6 + 3 = 9 hours