self Maths Puzzle

there is bridge.one side of the bridge one family is standing to cross the bridge.that is mid night.they have only one light.there
is chance will go other side at tome two members.i more then two members are go at a time the bridge id break,and they have only 17 min to go the other end other wise the bridge will cross with in that time .boy take 1 min to cross bridge,baby take 2 min to cross bridge ,mother take 5 min to cross bridge and father take 10 min to cross
bridge.

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self Other Question
A & B have some balls with them, if they add the balls equal to the square of their existing quantity with them, then B's will have 6 times more balls than A. If it is known that quantity of balls originally with A & B is a single digit,find it. Guys we can create a common email id.Where in everyone can share their recent placement experience.Questions and all relevant Data.Please post on this if agree.