Multiple choice

A boat covers 50 km in 2 hours downstream and covers the same distance in 5 hours upstream. Then find the distance covered in 3 hours in still water?

  1. 52.5 km

  2. 62.5km

  3. 55 km

  4. 58.7km

  5. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Downstream speed = 50/2 = 25 km/h. Upstream speed = 50/5 = 10 km/h. Still water speed = (25+10)/2 = 17.5 km/h. Distance in 3 hours = 17.5 × 3 = 52.5 km.