Question 44

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

Solution

speed = $$\frac{distance}{time}$$

distance = speed $$\times$$ time = 10 $$\times$$ 42 = 420 km

to cover the same distance in 7 hours

speed = $$\frac{420}{7}$$ = 60 Km/h

increase in speed = 60 -42 =18 km/h

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