Basic Numeracy/Quantitative Aptitude

945. A bath can be filled by the cold water pipe in 10 min and by hot water pipe in 15 min (independently each). A person leaves the bathroom after turning on both pipes simultaneously and returns at the moments when the bath should be full. Finding, however, that the waste pipe has been open he now closes it. In 4 min more, bath is full. In what time would be the waste pipe empty it?

	(a) 9 min
	(b) 12 min
	(c) 15 min
	(d) 14 min

946. A can build up a structure in 8 days and B can break it is 3 days. A has worked for 4 days and then B joined to work with A for another 2 days only. In how many days will A alone build up the remaining part of the structure?

	(a) 10
	(b) 9
	(c) 12
	(d) None of these

947. Pipes A and B can fill a tank in 12 min and 16 min respectively. Both are kept open for 'n' min and then B is closed and A fills the rest of the tank in 5 min. The time 'n' after which B was closed is:

	(a) 3 min
	(b) 2 min
	(c) 5 min
	(d) 4 min

948. In a 500m race Dishu beats Abhishek by 100m or 5 seconds. In another race on the same track at the same speeds. Abhishek and Prashant start at one end while Dishu starts at the opposite end. How many metres would Abhishek have covered, by the time Dishu meets Prashant given that Dishu's speed is 10 m/sec more than that of Prashant.

	(a) 200 m
	(b) 225 m
	(c) 250 m
	(d) 275 m

949. The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?

	(a) 80 km
	(b) 180 km
	(c) 60 km
	(d) 100 km

TOTAL

Detailed Solution

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