Logical In one km race A beats B by 5 seconds or 40 metres. How long does B take to run the kilometre ? Three pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
Anonymous
1y
B's speed = 40/5 = 8mtr / sec;
B's time complete 1 km = 125 seconds;
A's time to complete = 125-5 =120sec
Anonymous
1y
hrs needed to empty the tank = 3*8*2 = 48 hrs
48 hrs for 100%
for 4 pumps to complete in 1 day = 48/4 = 12 hrs
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