1Any takers??
A man with some passengers in his boat,starts perpendicular to flow of river 200m wide and flowing with 2m/s.Boat speed in still water is 4m/s.When he reaches half the width of the river the passangers asked him they want to reach the just opposite end from where they have started
a] Find the direction due to which he must row to reach the required end
b] How many times more total time,it would take to that if he would have denied the passangers.
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4 Answers
1its a simple sum from dc pandey
initially the vel is perpendicular to the flow so the toal drift is 2*t where t is the time obvousy t is 100/4=25s thereofre =50m
now it has to move in a direction so that the drift becomes 50m in the opp direction
let the anfle be @ with the perpendicular so vel along the horizontal direction is 4sin@ and along the normal 4cos@
time taken to reach the other end is 25/cos@ (simple math)
now drift will be 4sin@-2*25/cos@=50m
hope u cna solve after it if u cant then tel me in my chatbox i will post the full solution....
1its a simple sum from dc pandey
initially the vel is perpendicular to the flow so the toal drift is 2*t where t is the time obvousy t is 100/4=25s thereofre =50m
now it has to move in a direction so that the drift becomes 50m in the opp direction
let the anfle be @ with the perpendicular so vel along the horizontal direction is 4sin@ and along the normal 4cos@
time taken to reach the other end is 25/cos@ (simple math)
now drift will be 4sin@-2*25/cos@=50m
hope u cna solve after it if u cant then tel me in my chatbox i will post the full solution....
