A truck moves at the speed of 90 km/hr after repairing and moves at the speed of 80 km/hr before repairing. It covers x distance in 8 hours after repairing. How much time (in hours) will it take to cover 4x distance before repairing?
Speed of truck after repairing = 90 km/hr
Distance covered in 8 hours after repairing = $$x$$ km
Using, speed = distance/time
=> $$90=\frac{x}{8}$$
=> $$x=90\times8=720$$ km
Speed of truck before repairing = 80 km/hr
Now, time taken (in hours) to cover $$4x$$ km before repairing = $$\frac{4\times720}{80}=36$$
=> Ans - (C)
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