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Probability for being girl from morning slot = (1/2) × (x/(x+5)) Probability for being girl from evening slot = (1/2) × (8/(x+8)) ATQ – 1/2 [x/(x+5)+(8/(x+8))]=5/9 10/9=(x(x+8)+8(x+5))/(x+8)(x+5) 10/9=(x2+8x+8x+40)/(x2+13x+40) 10x2+130x+400=9x2+144x+360 x2–14x+40=0 x2–10x–4x+40=0 x(x –10) –4(x –10)=0 x=10,4 So, both I and II follow
A train approaches a tunnel a PQ. Inside the tunnel a cat located at a point i.e., 7/16 of a distance PQ measured from the entrance P. When the train wh...
Two trains A and B, were proceeding in the same direction on parallel tracks at 98 km/hr and 170 km/hr respectively. A man noticed that it took exactly ...
A train 125 m long passes a man running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:
How many seconds will a train 66 m in length, travelling at the rate of 43 km an hour, take to pass another train 86 m long, proceeding in the same dire...
A train has to cover a distance of 112 km in 14 hours. If it covers half journey in 3/5th time, then the speed of covering the remaining dist...
Two trains, A and B, cross each other in 20 seconds and 30 seconds respectively, when running in opposite and the same direction respectively. If the sp...
A freight train requires 17.6 seconds to pass a stationary person and 28 seconds to traverse a 260-meter-long tunnel. Simultaneously, a motorcycle can c...
Train X, traveling at a speed of 36 km/hr, crosses another train Y, which is moving in the opposite direction at a speed of 72 km/hr, in 't' seconds. If...
Gatiman express train crosses a platform in 45 seconds while it can cross a pole in 20 seconds. If the speed of the Gatiman express is 40 m/s, then find...
A train 275 metre long takes 33 sec to cross a man running at a speed of 5 km/hr in the direction same to that of train. What is the speed of the train?
