समय, दूरी और काम - Time,distance And Work
49. A can do a/b part of work in t1 days and c/d part of work in t2 days,then 
(i) If A is K times efficient than B, Then T(K + 1) = KtB
(ii) If A is K times efficient than B and takes t days less than B
Then = 
51. (i) If a cistern takes X min to be filled by a pipe but due to a leak, it takes Y extra minutes to be filled, then the time taken by leak
to empty the cistern
(ii) If a leak empty a cistern in X hours. A pipe which admits Y litres per hour water into the cistern and now cistern is emptied
in Z hours, then capacity of cistern is =
(iii) If two pipes A and B fill a cistern in x hours and y hours. A pipe is also an outlet C. If all the three pipes are opened together,
the tank full in T hours. Then the time taken by C to empty the full tank is 
52.(i) If t1 and t2 time taken to travel from A to B and B to A, with speed a km/h and b km/h, then distance from A to B is
(ii) If Ist part of distance is covered at the speed of a in t1 time and the second part is covered at the speed of b in t2 time, then
the average speed 
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