Everyday Rohan rides his bicycle as part of his exercise. While travelling at a constant rate, he rides 5 miles in 25 minutes. At this rate , how long would it take Rohan to cycle 10 miles ?

25 minutes

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30 minutes

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15 minutes

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50 minutes

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Solution

The correct option is D
50 minutes

The above problem is a case of direct proportion.

It is given that, Rohan rides his bicycle for 5 miles in 25 minutes.
Let x be the number of minutes that Rohan takes to cycle 10 miles.

Then, we have $\frac{5}{25} = \frac{10}{x}$

$x = \frac{25 \times 10}{5}$

Solving we get x= 50 minutes

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