The speed of all the people is different.

A can cross in 1 min

B can cross in 2 min

C can cross in 5 min

D can cross in 10 min

What is the minimum time to cross the bridge?

**Solution**

A & B cross (2min)

B comes back (2min)

C & D cross (10min)

A comes back (1min)

A & B cross (2min)

Total time=2+2+10+1+2=17min

Let me know if you have better solution.

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