Multiple choice

A man can row a boat at a speed of 120 km with stream in 5 hours. If the speed of the boat is double the speed of the stream, then the speed of stream is:

  1. 6 km/h

  2. 8 km/h

  3. 9 km/h

  4. 12 km/h
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed with stream = 120/5 = 24 km/h. Let stream speed be s, then boat speed is 2s. Speed with stream = 2s + s = 3s. 3s = 24, so s = 8 km/h.

AI explanation

The downstream speed is calculated as 120 km divided by 5 hours, resulting in 24 km/h. By applying the boats and streams formula for stream speed when the boat speed is double the stream speed, we compute 24 divided by (2 + 1), resulting in a stream speed of 8 km/h.

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