IBM Company Numerical Ability Time and Work

to do certain work alone 'A' takes 4 hrs,'B' takes 5 hrs and c takes 6 hrs.how long would A and b together take to do a work which C can do in 4 n half hours?

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IBM Other Question

A trader allows a discount of 5 percent to his customers. What price should he mark on a article the cost price of which is Rs. 800 so as to make clear profit of 25 percent on his outlay?

A.
Rs.1000

B.
Rs.1053

C.
Rs.1200

D.
Rs.11233
Best method to find out whether a given array already sorted,is sorted or not in minute time