Kangaroo

Kangaroo do 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 kangaroo do 30 jumps.

Result

t =  9 min

Solution:

t=30/10⋅ 1+2⋅ 3=9 mint=30/10 \cdot \ 1+2 \cdot \ 3=9 \ \text{min}

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