Strange Q

[RIJU]

There is 200 gallons water in pool A and 500 gallons in pool B. From 12pm, water is poured into pool A at the rate of k gallons per minute and drawn out from pool B at the rate of m gallons per minute. In terms of k and m, in how many minutes, A and B would has same amount of water?

[lego2401]

LET T = TIME

200 + Tk = 500 - Tm
=> Tk + Tm = 300
=> T(k + m) = 300
=> T = 300/(k+m)

[slkreddy]

Relative difference of water levels is 300
The relative velocity between the water in water in pool A and pool B is (K+M)
Time taken to level the both water levels is 300/(k+m)