A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round yo

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A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round yo
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A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round yo
A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round your answer to the nearest hundredth

A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round yo
题目要求女人出发15min中两人相距距离增加的速率,只要求出两人距离关于时间的函数,然后求微分就可以求得.而两人距离y^2=470^2+(6*5*60+6t+4t)^2
即y=根号下(470^2+(1800+10t)^2),然后求微分,再把t=15*60=900代入,得到的值精确到100ft/s.
思路就是这样,计算你应该可以完成的吧?

maybe he also does not undersand exactly.so he asks for help.

Could you tell some details,i can't understand the problem.may be you can wrote it again by chinese.

A man starts walking north at 6 ft/s from a point P.Five minutes later,a woman starts walking south at 4 ft/s from a point 470 ft due east of P.At what rate ( in ft/s ) are the people moving apart 15 min after the woman starts walking?Please round yo a man is walking on the grass.he starts from a,and walks straight along to the east for 3meters ..a man is walking on the grass.he starts from a,and walks straight along to the east for 3meters ,then then left for 120° ,then walks straight along for A man was walking.a forest A man was walking [ ] a forest MAN WALKING AROUND A CORNER怎么样 A man is walking on the grass.he starts from a,and walks straight along to the east for 3 meters,then turn left for 120°,then walks staight along for 3 meters and turn left for 120° again...How far away is he from A when he walks for 2005 meters? 阅读理解One day,the wind starts an argument with the sun.''I'm much stronger than you are.'' says the wind.''No,''answers the sun,''I'm much stronger than you are.''When they are arguing,they see a man walking down the road.He is wearing a heavy A man and a woman are walking,onwhich side should the man walk? The man is walking对walking 提问 An old man and a young man are walking in the park .是什么意思 I saw a man ( ) into the room just now用walk的适当形式是was walking还是walking A man was walking by .这个句子成分是哪些?为什么表语可以是walking by这种形式？ original soundtrack dead man walking original soundtrack dead man walking They saw a man _____ along the road.A.walking B.walk C.walks a man ( )in front of his car.A.walk B.walks C.walking D.work 组句:man,yelloow,walking,a,hat,is,wearing,a.如题. 对划线部分提问 I saw a young man walking up to the phone box画线得a young man