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A man covers a certain distance between his house and office on scooter. Having an average speed of 30 km/h, he is late by 10 minutes. However, with a speed of 40 km/h, he reaches his office 5 minutes earlier. Then the distance between his house and office is:

A man covers a certain distance between his house and office on scooter. Having an average speed of 30 km/h, he is late by 10 minutes. However, with a speed of 40 km/h, he reaches his office 5 minutes earlier. Then the distance between his house and office is: Correct Answer 30 km

Let, the distance between his house and office is X km.

When he covers 30 km/h

He covers Xkm in X/30 hours

Similarly, 

When he covers 40 km/h

He covers Xkm in X/40 hours

(X/30) - (X/40) = 15/60 hrs

X = 30 km

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