Question : 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 in time?
Option 1: 30.8
Option 2: 32.5
Option 3: 32
Option 4: 31.2
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Correct Answer: 32
Solution :
Given: Total distance = 90 km
Time = 1 hour
Journey in first 25 minutes = 15.2 × 25 × 60
= 22800 m
= 22.8 km
Remaining distance = 90 – 22.8 = 67.2 km
Remaining time = 60 – 25 = 35 minutes
$\therefore$ Speed in m/s = $\frac{67.2}{35}×60×\frac{5}{18}$
= 32 m/s.
Hence, the correct answer is 32.
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