Question

# A car moves with a speed of $$40$$km$$/$$h for $$15$$ minutes and then with a speed of $$60$$ km$$/$$h for the next $$15$$ minutes. The total distance covered by the car is :

A
100km
B
25km
C
15km
D
10km

Solution

## The correct option is B $$25$$kmGiven data:Speed, $$S_1$$ is 40 km/hrSpeed, $$S_2$$ is 60 km/hrTime, $$T_1$$ is 15 minutes $$= \dfrac 14$$ hrTime, $$T_2$$ is 15 minutes $$= \dfrac 14$$ hrUsing $$S_1$$ and $$T_1$$ in the equation:Distance $$=$$ Speed $$\times$$Time$$D_1 = S_1 \times T_1$$   $$=40 \times \dfrac 14$$   $$=10$$ kmsUsing $$S_2$$ and $$T_2$$ in the equation: Distance $$=$$ Speed $$\times$$ Time$$D_2=S_2\times T_2$$    $$=60\times \dfrac{1}{4}$$    $$=15$$ kmsTotal kms covered $$=D1+D2=10+15=25$$ kms. ScienceNCERTStandard VII

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