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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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Last Updated : 03 May, 2019
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