P walks with a speed of 6 km hr and after 5 hr of his start Q starts running towards P at a spe...........

Quantitative Aptitude ( CCS) Time & distance

P walks with a speed of 6 km/hr and after 5 hr of his start, Q starts running towards P at a speed of 8 km/hr. At what distance from start will Q catch P.

100

110

120

140

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Explanation:

In 5hrs, P will cover 30 km. Now, at some distance ‘x’. So P will cover X distance and Q will cover 30 + X.
x/6 = (30+x)/8
x = 90. So distance from start after which Q will catch P = 90+30 =120km.