Time and Distance Q.3

3Pankaj starts from home at a speed of 30 km per hour and reaches his school 20 minutes late. Then the next day he increases his speed by 15 km per hour but still gets late by 8 minutes. How far is his school from his home?

Option : A
Explanation : Let distance be D
With speed 30km/hr he is 20 minutes late
With speed 45 km/hr he is 8 minutes late
∴ Difference between two time
= 20 - 8 = 12min = 12/60 hours
T = D/S
∴ D/30 - D/45 = 12/60
∴ D = 18km

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