Multiple choice

A ship moves at a speed of 32 km/h in still water. It goes 55 km in upstream in 2 hours 45 minutes. How much time will it take to cover the same distance downstream?

  1. 1H 45 min

  2. 2H 25 min

  3. 1H 15 min

  4. 2 H 45 min
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Upstream speed = 55 km / (2h 45m) = 55/2.75 = 20 kmph. Stream speed = 32 - 20 = 12 kmph. Downstream speed = 32 + 12 = 44 kmph. Time downstream = 55/44 = 1.25 hours = 1 hour 15 minutes. The relationship between still water speed, stream speed and direction is key.

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