Amit is walking at a speed of 10 km/hr. After every kilometer, he takes a rest for 5 minutes. What is the time taken to cover a distance of 5 kilometers by Amit?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 50 minutes
The total time is the walking time plus the rests, and Amit rests only between one kilometre and the next: once he finishes the 5th kilometre he has arrived, so there is no rest at the end.
The walking time (at 10 km/hr):
1 km takes \(\frac{60}{10}=6\) minutes
Walking 5 km: \(5\times6=30\) minutes
The rests and the total (a rest only between one kilometre and the next):
Rests after the 1st, 2nd, 3rd and 4th kilometres: \(4\times5=20\) minutes
Total time \(=30+20=50\) minutes
The value 55 minutes in Option (1) counts a fifth rest after the last kilometre, which is not part of the journey.