Question

The speed of a boat in still water is 6 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance or 22.5 km and comes back to the starting point. The total time taken by him is:

विकल्प

• 10 hours

• 4 hours 10 minutes

• 6 hours 10 minutes

• 8 hours

Answer 1

8 hours

Explanation:

`22.5/(6 + 1.5) + 22.5/(6 - 1.5)`

⇒ `22.5/7.5 + 22.5/4.5`

⇒ 3 + 5 = 8 hours