A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in in 7 hours, the speed of the car (km/h) must be increased by :

A car can finish a certain journey in 10 hours at a speed of 42 kmph.

1.	A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in in 7 hours, the speed of the car (km/h) must be increased by :
A.	2 km/hr
B.	5 km/hr
C.	8 km/hr
D.	4 km/hr
Answer» D. 4 km/hr

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A car can finish a certain journey in 10 hours at a speed of 42 kmph. In order to cover the same distance in in 7 hours, the speed of the car (km/h) must be increased by :

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