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In river crossing problems please tell me all the conditions when the boat will not be able to cross the the river.
if the boat is always rowed against the flow of river it would find difficulties to cross the river.From the formulae:shortest tme it would take to cross the river is=>t = l/vcosthethawhere l is the width of the riverv is the man’s speed and thetha is the angle it make swith river (horizontal).Now when the boat will not be able to cross the the river then,t should approach to infinity.and for that thetha should be 90 degree.
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