Rickety Bridge

Logic Level 3

Four people need to cross a rickety bridge at night.Unfortunately,they have only one torch and the bridge is too dangerous to cross without one.The bridge is only strong enough to support two people at a time.Not all people take the same time to cross the bridge.Times for each person:1min,2mins,7mins and 10mins.

What is the shortest time needed for all four of them to cross the bridge? (NOTE: If it is 20 mins type 20)

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