Question 104

A car completed a journey of 400 km in $$12\frac{1}{2}$$ hrs. The first $$\frac{3}{4}$$th of the journey was done at 30 km/hr. Calculate speed for the rest of the journey.

Solution

Distance covered at 30 km/hr = $$\frac{3}{4}\times400=300$$ km

Let remaining distance, i.e. 100 km be covered at speed = $$x$$ km/hr

According to ques,

=> $$\frac{300}{30}+\frac{100}{x}=\frac{25}{2}$$

=> $$\frac{100}{x}=12.5-10$$

=> $$x=\frac{100}{2.5}=40$$

$$\therefore$$ Speed for the rest of the journey = 40 km/hr

=> Ans - (C)

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