Three pumps P, Q and R can fill an overhead water tank in 6 hr, 10 hr and 12 hr respectively. Pump operator start all three pumps at 7 pm.The pump P goes breakdown at 8 : 30 pm. By what time pump operator should switch off the other two pumps just before the tank starts overflow?

Three pumps P, Q and R can fill an overhead water tank in 6 hr, 10 hr and 12 hr respectively. Pump operator start all three pumps at 7 pm.The pump P goes breakdown at 8 : 30 pm. By what time pump operator should switch off the other two pumps just before the tank starts overflow?
1). 11 : 05 pm
2). 11 : 17 pm
3). 10 : 50 pm
4). 10 : 19 pm

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