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Question

Meenakshee cycles to her school at an average speed of $$12\ km/h$$ and take $$20$$ minutes to reach her school. If she wants to reach her school in $$12$$ minutes, her average speed should be

A
$$15\ Km/hr$$
B
$$16\ Km/hr$$
C
$$20\ Km/hr$$
D
$$8\ Km/hr$$
Solution
Verified by Toppr

Correct option is C. $$20\ Km/hr$$
speed of cycle $$=12km/hr$$
Time taken by Meenakshi $$=20 minutes$$
Total distance $$=\dfrac{12 \times 20}{60}=4km$$
The average speed should be $$=\dfrac{4}{\dfrac{12}{60}}=\dfrac{4 \times 60}{12}=20\ km/hr$$

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