| | Question 10

If an employee walks at speed of 10 km at 3 km/hr, he will be late by 20 minutes. If he walks at 4 km/hr, how early from the fixed time he will reach ?
(A) 18 minutes
(B) 24 minutes
(C) 30 minutes
(D) 36 minutes


Answer: (C)

Explanation: Time taken at 3 km/hr = Distance/speed
= 10/3
Actual time is obtained by subtracting the late time
So, Actual time = 10/3 – 1/3 = 9/3 = 3 hour
Time taken at 4 km/hr = 10/4 hr
Time difference = Actual time – time taken at 4 km/hr
= 3 – 10/4
= 1/2 hour
Hence, he will be early by 30 minutes.

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