TCS Company Numerical Ability Pipes and Cistern

If a pipe can fill the tank within 6 hrs but due to leak it took 30 min more now if the tank was full hw much tym will it take to get empt-yed through the leak?

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TCS Other Question

The citizens of planet nigiet are 4 fingered and have thus developed their decimal system in base 4. A certain street in nigiet contains 100 (in base 4) buildings numbered 1 to 100. How many 5s are used in numbering these buildings?
(a) 48 (b) 8 (c) 20 (d) 16

A gun has a nozzle velocity 330 mt/sec. It has to meet a target which is at a distance 5km. It retards at a rate of 8 mt/sec/sec while travelling in air. Find the velocity at a place where the bullet will meet the target.