Multiple choice

A boat can travel with a speed of 14 km/hr in still water. If the speed of stream is 4 km/hr, find the time taken by the boat to go 90 km downstream.

  1. 2 hours

  2. 3 hours

  3. 5 hours

  4. 9 hours

  5. 15 hours
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C Correct answer
Explanation

Downstream speed = 14 + 4 = 18 km/hr. Time = Distance / Speed = 90 / 18 = 5 hours.

AI explanation

The downstream speed of the boat is calculated by adding the speed of the boat in still water to the speed of the stream, giving 14 km/hr plus 4 km/hr, which equals 18 km/hr. Using the formula Time equals Distance divided by Speed, the time taken to travel 90 km is 90 divided by 18. This calculation results in a time of 5 hours. The result is 5 hours.

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