Multiple choice

Mahesh can row a boat at 10kmph in still water. IF the speed of the stream is 6kmph, then find the time taken to row a distance of 80km down the stream?

  1. 4hrs

  2. 8hrs

  3. 3hrs

  4. 2hrs

  5. None of these

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

Downstream speed = boat speed + stream speed = 10 + 6 = 16 kmph. Time = distance/speed = 80/16 = 5 hours. None of the given options (4, 8, 3, 2 hours) match the correct answer of 5 hours, so 'None of these' (E) is correct.