Question
A train takes 10 seconds to pass
a tree and 14 seconds to pass through a tunnel 112 meters long. A bike is moving in the same direction as the train at a speed of 33 m/s. How much time will the bike take to completely cross the train?Solution
ATQ, Let the length of the train = ‘y’ metres Then, distance covered by the train in 10 seconds = ‘y’ metres Distance covered by the train in 14 seconds = (y + 112) metres So, distance covered by the train in (14 – 10) seconds = y + 112 – y = 112 metres So, speed of the train = (112/4) = 28 m/s So, length of the train = 28 × 10 = 280 metres Relative speed of the bike with respect to the train = 33 – 28 = 5 m/s So, time taken by the bike to cross the train = (280/5) = 56 seconds
- What will come in place of the question mark (?) in the following series?
13, 15, 18, 23, 30, ? Find the missing character.
165      155     135     ?     65      15
...10, 10, 15, 30, 75, ?
5   3   4   7.5   17    ?    138
- What will come in place of the question mark (?) in the following series?
24, 35, 57, 90, 134, ? 14, 20, ?, 50, 74, 104
30, 42, 54, 66, ?, 90
11    16    42    141    ?   2945   17700
...7, 8, ?, 52, 209, 1046
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