Multiple choice

A boat travels downstream from pier X to pier Y at a speed of 15 miles per hour. On the return journey upstream, due to the water current, the boat can travel only at 10 miles per hour. If the one-way distance between the piers is 60 miles, what is the total time taken for a round trip?

  1. 5 hours

  2. 6 hours

  3. 8 hours

  4. 10 hours

  5. 12 hours
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Downstream time = 60 / 15 = 4 hours. Upstream time = 60 / 10 = 6 hours. Total time = 4 + 6 = 10 hours.

AI explanation

The total time for a round trip is the sum of the distance divided by the downstream speed plus the distance divided by the upstream speed. For the 60-mile journey, the downstream time is 60/15, which is 4 hours, and the upstream time is 60/10, which is 6 hours. Adding these times gives a total round trip time of 10 hours.

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