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Bag A=5White, 2 Black balls Bag B=2 White, 3 Black balls. Probability of selecting a bag = 1/2 Now, the Probability of picking a black ball = from bag A or from bag B = ²C ₁ /³C ₁ + ³C ₁ /³C ₁ =2/5+3/5 = 1 So, required probability = (1/2) *1 = 1/2
Two trains, 'A' and 'B', are heading towards each other from opposite ends of a 360-meter bridge. Train 'A' travels at a speed of 15 m/s, and train 'B' ...
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...
800 metres long train crosses a man who is moving in the same direction with a certain speed, in 40 seconds. If the same train can cross a tree in 20 se...
Time is taken by two trains running in opposite directions to cross a man standing on the platform in 27 seconds and 17 seconds respectively. It took 21...
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...
A man running at the speed of 5 kmph was over taken by the train moving with the speed of 41 kmph in 20 seconds. Find the length of train.
A train can cross a pole in 18 seconds. While if the train increased its speed by 75% then time taken by it to cross 444 metres long platform is 42 seco...
1600 metres long train crosses a man who is moving in the same direction with a certain speed in 25 seconds. If the same train can cross a pole in 20 se...
350 metre long train ‘A’ is running with a speed of 43.2 km/hr. Train ‘B’ which is 387 metre long is running with a speed of 90 km/h in opposite...
A train crosses a platform in 48 seconds travelling with a speed of 120 km/hr. If the length of the train be 600 metres, then the length (in metres) of ...
