Question
A frog leaps across 15 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the eighth  lily pad to the thirteenth lily pad. How long does it take for the frog to leap from the fifteenth lily pad to the eighteenth lily pad?
4 m

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A frog leaps across 15 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the eighth  lily pad to the thirteenth lily pad. How long does it take for the frog to leap from the fifteenth lily pad to the eighteenth lily pad?