Multiple choice

The speed a boat in still water is 5 km/hr, and it can covers a distance of 1 km in 15 min in upstream. Then find the distance covered by the boat in downstream in 1 hr 45 minutes ?

  1. 7

  2. 3

  3. 4

  4. 10.5

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Speed in still water = 5 km/h. Distance 1 km upstream in 15 min means upstream speed = 4 km/h. Stream speed = 5-4 = 1 km/h. Downstream speed = 5+1 = 6 km/h. In 1h45m (7/4 hours): 6 × 7/4 = 10.5 km.

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