Q. A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is
A) 1/4
B) 1/10
C) 7/15
D) 8/15

Related Questions

Q. if pipe A is 50% faster than C and pipe B is 25% slower than A in filling water in a tank. if all the 3 fill together in1hr 20 min. in what time A alone can fill the tank.  
A) 3.22 hours
B) 4 hours
C) 5.5 hours
D) 6 hours
Q. A contractor undertakes to dig a canal 12km long in 350 days and employs 45 men. after 200 days he finds that only 4.5km of the canal has been completed. find the number of extra men he must employ to finish the work in time
A) 45
B) 50
C) 65
D) 55
Q. A,B and C can do work in 8,16,24 days respectively, they all begin together. A continues to work till it is finished, C leaving off 2 days and B one day before its completion.In what time is the work finished?
A) \(8{}^1/_3\)
B) 5
C) 3
D) 2
Today Challenging Question
Q. If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream ?
A) 13 km/hr
B) 26 km/hr
C) 34 km/hr
D) none of these
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