Question 81

Time taken for a journey is 50 minutes at 48 km/h speed. What should be the speed, if the journey time is reduced by 10 minute

Solution

Given,

Time = 50 minutes = $$\frac{50}{60}hr$$ = $$\frac{5}{6}hr$$ and

Speed = 48 km/h

We know that, Distance = S×T

Distance = $${48}\times{\frac{5}{6}}$$ = 40 km

New time will be 10 minutes less, i.e., 50 - 10 = 40 minutes

Therefore, Time = $$\frac{40}{60} hr$$ = $$\frac{2}{3} hr$$

Now we know,

Speed = Distance/Time

New speed = $${40}\times{\frac{3}{2}}kmph$$ = 60kmph

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