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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
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B
25km
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C
15km
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D
10km
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Solution

The correct option is C $$25km$$
B. Case I:
Speed $$= 40 km / h$$
Time $$= 15 min = 15/60 hour$$.
Distance = speed * Time
$$=40*\frac{15}{60}$$
$$= 10 km$$,
Speed $$= 60 km/h$$,
Time $$= 15 min = 15/60 hour$$
Distance = speed * Time
$$=60*\frac{15}{60}$$
$$= 15 km$$
Total distance $$= 10 km +15 km$$
$$= 25 km$$.

Physics

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