Jehangir had to cover a distance of 90 km in an hour. During the first 25 minutes, he travelled at a speed of 15.2 metres per second. How many metres did Jehangir cover per second during the remaining period to reach his destination just on time?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 32.
Speed = Distance/time
According to the question
In the first 25 minutes, he travelled the distance with a speed of 15.2 m/s = 25 × 60 × 15.2 = 22800 meters = 22.8 km
The remaining distance = 90 km - 22.8 km = 67.2 km
Hence, this distance covered by him in 35 minutes with a speed of = 67.2/35 × (1000/60) = 32 meters/second