Question
A frog leaps across 18 lily pads which are of the same distance apart. It takes the frog 15 seconds to get from the ninth  lily pad to the twelfth lily pad. How long does it take for the frog to leap from the ninth lily pad to the sixteenth lily pad?
4 m

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A frog leaps across 18 lily pads which are of the same distance apart. It takes the frog 15 seconds to get from the ninth  lily pad to the twelfth lily pad. How long does it take for the frog to leap from the ninth lily pad to the sixteenth lily pad?