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###### Woman launches her boat from pointOnbank of a straight river; 3km wide, and wants to reach point B, Skm downstream on the opposite bank quickly as possible She could row her boat directly across the river to point C and then run to B. or" she could row directly to B; Or she could row to some point D between C and B and then run to B. If she can rOW 6kmyh and run Skmyh, where should she land to reach B as SOon as possible? (We assume that the speed of the water is negligible compared with th

woman launches her boat from point On bank of a straight river; 3km wide, and wants to reach point B, Skm downstream on the opposite bank quickly as possible She could row her boat directly across the river to point C and then run to B. or" she could row directly to B; Or she could row to some point D between C and B and then run to B. If she can rOW 6kmyh and run Skmyh, where should she land to reach B as SOon as possible? (We assume that the speed of the water is negligible compared with the speed at which the woman rOws: ) dy (b If y = â‚¬ + tanz, show that cos? _ 2y + 2x = 0. dr

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