1.

1). 1202). 37.53). 454). 90

Answer»

TAPS R, S and T can fill a tank in 90 min, 100 min and 180 min

R’s one-min work = 1/90

S’s one-min work = 1/100

T’s one-min work = 1/180

R, S and T‘s one-min work = 1/90 + 1/100 + 1/180 = 2/75

Total TIME taken by R, S and T to fill the tank = 1/(2/75) = 37.5 min



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