1. 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?





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  • By: anil on 05 May 2019 02.07 am
    Speed of truck after repairing = 90 km/hr Distance covered in 8 hours after repairing = $$x$$ km Using, speed = distance/time => $$90=frac{x}{8}$$ => $$x=90 imes8=720$$ km Speed of truck before repairing = 80 km/hr Now, time taken (in hours) to cover $$4x$$ km before repairing = $$frac{4 imes720}{80}=36$$ => Ans - (C)
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