1. A taxi going at 90 km/hr takes 35 minutes to travel a certain distance. By how much should it increase its speed (in km/hr) to travel the same distance in 21 minutes?
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By: anil on 05 May 2019 01.46 am
Speed of car = 90 km/hr Time taken by car = 35 minutes = $$frac{35}{60}$$ km/hr => Distance travelled = speed x time = $$90 imesfrac{35}{60}=52.5$$ km Thus, speed required to travel the same distance in 21 minutes ($$frac{21}{60}$$) hr = $$frac{52.5}{frac{21}{60}}$$ = $$150$$ km/hr $$ herefore$$ Increase in speed = $$150-90=60$$ km/hr => Ans - (A)
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