Question 16

A bus moves at a speed of 84 km/hr after repairing and moves at a speed of 56 km/hr before repairing. It covers 2x distance in 8 hours after repairing. How much time (in hours) will it take to cover x distance before repairing

Solution

Speed of bus after repairing = 84 km/hr

Distance covered in 8 hours after repairing = $$2x$$ km

Using, speed = distance/time

=> $$84=\frac{2x}{8}$$

=> $$x=84\times4=336$$ km

Speed of bus before repairing = 56 km/hr

Now, time taken (in hours) to cover 336 km before repairing = $$\frac{336}{56}=6$$

=> Ans - (C)

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