Kangaroo does 10 jumps in 1 minute and then three minutes lie, then will make 10 jumps in 1 minute and 3 minutes lie, and so on. Find the shortest time in which a kangaroo does 30 jumps.

Correct answer:

t =  9 min

Step-by-step explanation:

t=30/10 1+2 3=9 min

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