1.

A person, if he walks at speed of 12 km/h, reaches his office 20 min late. When he takes auto rickshaw which covers 120 km in 2 hrs, he reaches his office 265 min earlier. Find house & office distance

Answer»

76 km



Let the DISTANCE between the office and the house be D km.
Auto’s SPEED = 120/2.5 = 48 km/h
Then, D/12 – 20/60 = D/48 + 265/60
= D(1/12 – 1/48) = 285/60
= 3D/48 = 285/60
= D = 76 km


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