Question

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Answer 1

For the second image: there would be 60 millimeters of water after 1/4 of a hour 1/4 of an hour is 15 minutes and 15 times 4 is 60.

Answer 2

The ratio walkers/riders is $2:7=\dfrac{2}7$ hence the number of riders is $\boxed{\dfrac{7}2}$ times the number of walkers<em />

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$1/4\text{ hour}=\dfrac{60}4\text{ minutes}=15\text{ minutes}$

In 15 minutes, $15\cdot4=\boxed{60\text{ mm}}$ will have dropped.

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