a train runs first half of the distance at 40 km/hr and the remaining half at 60 km/hr. What is the average speed for the entire journey?
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A boy travels 285kms in 6hours in 2 stages.. first stage- 40km. second stage-55km.how much distance does he covers?
There were 750 people when the first song was sung. After each song 50 people are leaving the hall. Howmany songs are sung to make them zero?
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A chain is broken into three pieces of equal lengths containing 3 links each. It is taken to a backsmith to join into a single continuous one . How many links are to to be opened to make it ?
A team P of 20 engineers can complete a task in 32 days. Another team Q of 16 engineers can complete the same task in 30 days. Then the ratio of working capacity of 1 member of P to that of a member of Q is:
Father is aged three times more than his son Ronit. After 8 years, he would be two and a half times of Ronit's age. After further 8 years, how many times would he be of Ronit's age? A.2 times B.2 1/2times C.2 3/4times D.3 times
If 1/4 of the time from midnight plus 1/2 of the time from now to midnight is the present time,then what is the present time ?
the bucket size is 10KB.it takes 0.0001 KB/milisec to fill bucket.the bucket takes 100 or 1000 milisec to reach to destination.it takes 100 milisec to pass acknowledgement from dest to source.so calculate how much time will it take to pass N KB ,write formula.
Thirty men take 20 days to complete a job working 9 hours a day. How many hour a day should 40 men work to complete the job? (a) 8 hrs (b) 7 1/2 hrs (c) 7 hrs (d) 9 hrs
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You are driving along in your car on a wild, stormy night, it's raining heavily, when suddenly you pass by a bus stop, and you see three people waiting for a bus: An old lady who looks as if she is about to die. An old friend who once saved your life. The perfect partner you have been dreaming about. Which one would you choose to offer a ride to, knowing very well that there could only be one passenger in your car? This is a moral/ethical dilemma that was once actually used as part of a job application. * You could pick up the old lady, because she is going to die, and thus you should save her first; * or you could take the old friend because he once saved your life, and this would be the perfect chance to ! pay him back. * However, you may never be able to find your perfect mate again.
Two distinct no's are taken from 1,2,3,4......28. Find the probability that their sum is less than 13