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greatuser
 one year ago
it took 2hrs
greatuser
 one year ago
it took 2hrs

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greatuser
 one year ago
Best ResponseYou've already chosen the best response.0it took 2hrs for boat to go from a to b with current and 6hrs to go back against curent. assuming constant speed of boat in both directions, how long wil it take raft (with speed equal to speed of curent) to go from a to b?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1let the boat (without any current) take 'x' hrs to reach from a to b and the raft (with speed equal to speed of current) take 'y' hrs to reach from a to b when current assist boat, total time taken was 2 hours, so xy= 2 when current was against the boat, time taken was 6hrs , so x+y =6 find 'y' from here :)

greatuser
 one year ago
Best ResponseYou've already chosen the best response.0that means x=y+2=6y which means y=2? that cant be right though

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1yeah, i think i have overlooked something speed = distance / time here, distance is same so, speed * time will be constant let their speed be 'a' and 'b' so, (a+b)*2=(ab)*6=distance =d and you need, time taken by raft, = d/b try it!

greatuser
 one year ago
Best ResponseYou've already chosen the best response.0but d and b are both unknown. how can we solve it?

greatuser
 one year ago
Best ResponseYou've already chosen the best response.0please help i still don't get it

greatuser
 one year ago
Best ResponseYou've already chosen the best response.0so far, a= speed of boat b = sped of current 6a6b = 2a + 2b meaning a = 2b

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1"d" is an arbitrary distance that is constant for all trips....let d=1 then 1/(a+b) = 2 1/(ab) = 6 a = 2b 1/3b = 2 1/b = 6 > b = 1/6 > d/b = 6 it would take raft 6 hours

greatuser
 one year ago
Best ResponseYou've already chosen the best response.0oh i get i now thanks a lot
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