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Tank can be filled by pipe A alone in 90 min and by pipe B alone in 60 min. There is a tap in bottom of tank which can empty the tank in 18 min. In a condition when tank is filled by pipe A and B for 20 min and then close and open the bottom tap. The time taken by tap to empty the tank is ….. min.
Six students of a school – Radha, Raj, Rahul, Mira, Aarav and Arijit are selected from different classes – 7th, 8th, 9th, 10th, 11th and 12th standards (not necessarily in the same order) to perform individually in the school annual function. Their order of performances is decided as per their classes. The one who is in 12th class will perform first, then after that 11th class student will perform and so on. Mira will perform immediate after the Rahul but before Arijit. Mira does not study in 8th class. Raj will perform immediate after Aarav but Raj neither studies in 8th class nor in 7th class. Who will perform last in the school annual function?
A mouse is running at the speed of 15 m/min. After 12 min a cat saw him and started running to catch the mouse at the speed of 16 m/min. How much time will it take to catch the mouse if the cat can boost his speed by 1 m/min in every 5 min?
Three pipes A, B, C can individually fill a tank in 45 min., 60 min., and 30 min. respectively. If all the three pipes are simultaneously opened in an empty tank, such that pipes A and B are closed after 9 min. and 12 min. respectively, how much time will pipe C take alone to fill the remaining part of the tank?
Five clocks ring simultaneously at 5 pm. They ring at regular intervals of 12 min, 15 min, 20 min, 30 min, and 60 min respectively. The time when all five clocks ring together next is:
A water tanker can be filled by 2 pipes A & B separately in 16 min & 32 min respectively. The outlet of the tanker is partially open and it can empty the full tanker completely in 1 hour 4 min. Pipes A & B were opened simultaneously for 9 min to fill the tanker but the partially open outlet was not closed. After 9 min the pipes A & B were closed and the tanker then went to Mohan's house, 6 km away to deliver water. If the tanker moved at a constant speed of 36 km/hr, approximately what percentage of the tanker was full, when it reached Mohan's house? 
Monica takes 9 hrs 15 minutes in walking a distance and riding back to the same place where she started. She could walk both ways in 11 hrs 12 minutes. The time taken by her to ride back both ways is: A. 7 hrs 18 min B. 7 hrs 35 min C. 7 hrs 45 min D. 7 hrs 15 min
Josna takes 4 hrs 30 minutes in walking a distance and riding back to same place where she started. She could walk both ways in 5hr. 40 minutes. The time taken by her to ride back both ways is. A. 3 hr 20 min B. 3 hr 35 min C. 3 hr 45 min D. 3 hr 15 min
N items are stored in a sorted doubly linked list. For a delete operation, a pointer is provided to the record to be deleted. For a decrease-key operation, a pointer is provided to the record on which the operation is to be performed. An algorithm performs the following operations on the list in this order: Θ(N) delete, O(log N) insert, O(log N) find, and Θ(N) decrease-key. What is the time complexity of all these operations put together?
Four horses participated in a race, they started running simultaneously in circular track. They took 45 min, 40 min, 30 min and 20 min respectively to complete one round. They meet at starting point for the first time after how much time?