The average age of 12 players of a team is 25 years. If the captain's age is included, the average age increases by 1 year. The age of the captain is:
(A) 25 yrs.
(B) 36 yrs.
(C) 38 yrs.
(D) 26 yrs.
Harsha is 40 years old and Ritu is 60 years old. How many years ago was the ratio of their ages 3 : 5 ?
(A) 10 years
(B) 20 years
(C) 37 years
(D) 5 years
Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 10 hours – pipe A, B, C together can fill the same tank in 12 hours. In how many hours pipe C can fill the tank alone?
(A)
(B) 4 hours
(C) 15 hours
(D) Not possible
Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15 hours respectively. First A was opened. After 2 hour, B was opened and after 4 hours from the start of A, C was also opened. Find the time in which the cistern is just full.
(A) 2 hours
(B) 4 hours
(C) 2 hours 52 min
(D) 5 hours 44 min.
(E) None of these
By what least number should 4320 be multiplied so as to obtain a number which is perfect cube?
(A) 60
(B) 80
(C) 40
(D) 50
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