Question
A frog leaps across 12 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the first  lily pad to the eleventh lily pad. How long does it take for the frog to leap from the first lily pad to the tenth lily pad?
4 m

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A frog leaps across 12 lily pads which are of the same distance apart. It takes the frog 20 seconds to get from the first  lily pad to the eleventh lily pad. How long does it take for the frog to leap from the first lily pad to the tenth lily pad?