Integers 11, 12, 13, 14 are written on 4 cards they are well shuffled. Two cards are taken at random without replacement. What is the probability that the sum is at least 25?
Out of these 12 combinations, four are having the sums at least 25. Probability of picking two cards, whose sum is at least 25 will thus be 8/12 = 2/3
Two trains ‘A’ and ‘B’ started from station ‘P’ and ‘Q’ towards station ‘Q’ and ‘P’ respectively at the same time. When they met...
A train of length 287 m, running at 80 km/h, crosses another train moving in the opposite direction at 37 km/h in 18 seconds. What is the length of the ...
Two trains approach each other at 21 kmph and 24 kmph from 2 places 270 km apart. After how many hours they will meet?
A train running with the speed of 38 m/s crosses a man walking with the speed of 5 m/s in the same direction in 10 seconds, find the length of train.
Time is taken by two trains running in opposite directions to cross a man standing on the platform in 36 seconds and 21 seconds respectively. It took 27...
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.
Two poles are positioned at a certain distance from each other. A train traveling at a speed of 90 km/hr passes the first pole in 5 seconds and reaches ...
A 250-meter-long train crosses a 150-meter-long train coming from the opposite direction in 20 seconds. If the speed of the first train is 45 km/h, then...
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...
Two trains of same length are running in parallel tracks in the same direction with speed 80 km/hr and 110 km/hr respectively. The latter completely cro...
