Multiple choice

Ratio of speed of boat downstream and speed of stream is 9:1, speed of current is 3 km per hr, find distance travelled upstream in 5 hours.

  1. 65

  2. 85

  3. 95

  4. 105

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

Given current speed = 3 km/hr and downstream speed : current speed = 9:1, so downstream = 27 km/hr. Boat speed in still water = 27 - 3 = 24 km/hr. Upstream speed = 24 - 3 = 21 km/hr. Distance in 5 hours = 21 × 5 = 105 km.

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