GMAT Exam Category

A person leaves his house and travelling at 4 kmph reaches his office 10 minutes late. Had he travelled at 7kmph he would have been 20 mins early. Find the distance from the house to the office?
a)14/3 b)2 c)14/9 d)14/6

Read Solution (Total 1)

4=D/(T+10/60)---(1)
7=D/(T-20/60)---(2)
Simplifies form : 24T-6D=-4 -----(3)
21T-3D=7-------(4)
Solving (3) and (4)
T=1, D=14/3
Answer is a) 14/3
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GMAT Other Question

A worker reaches his work place 15 minutes late by walking at 4kmph from his house. The next day he increases his speed by 2kmph and reaches in time. Find the distance from his house to his work place
a)2 km b)6 km c)8 km d)3 km
Find the time taken by a train 150 m long running at a speed of 63 kmph to cross another train of length 100 m long running at a speed of 45 kmph in the same direction
a)25 seconds b)50 seconds c)75 seconds d)100 seconds