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Classical Mechanics Level pending

4 persons a,b,c,d has to cross a bridge and is accompanied by a torch.(a) crosses the bridge in 1 minute, (b) in 2 minute, (c) in 7 minute and (d) in 10 minute. At a time only two person can cross the bridge and also if the least time person and highest time person go with each other the time of greatest will be counted also any person cannot cross the bridge without torch .What will be the least time for all to cross the bridge

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