A boat travels for 3 hours downstream and then
turns back and rows for the next 3 hours
upstream. If the boat is yet 30 km away from the
starting point, find the speed of the current.
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Answer:
till water speed = 1kmph
upstream distance ; 3*(x-1)
downstream distance ; 3*(x+1)
total distance = 12
solve for x ; 3x-1+3x+1 = 12; x = 2
downstream distance ; 3*3 ; 9 km and upstream dist ; 3 * 1 ; 3 km
total distance need to be covered ; 6km
upstream speed = (x-1 ) ; (2-1 ) ; 1 kmph
total time ; 6 hr
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