Question

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

विकल्प

• 30 km

• 10 Km

• 20 km

• 40 km

Answer 1

30 km

Explanation:

When Speed is 30 Km/hr reaches 10 minutes late

When Speed is 40 Km/hr reaches 5 minutes earlier.

Let Distance be D and T = D/S

`"D"/30-"D"/40=15` min or `15/16` hr

`(4"D"-3"D")/120=15/60`

D = 30 Km