Aptitude test Interview Numerical Ability

Two trains are opposite to each other , bird is on one train . Speed of both trains are 25km/hr & 50 km apart . When trains starts(against each other) , bird also start flying from one train to other , till they clash. Speed of bird is 100km/hr . Distance traveled by bird till trains clash. ?
A. 100
B. 86
C. 98
D. 45

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Aptitude test Other Question
The difference between two numbers is 13th when the larger number is divided by the smaller one the quotient is 6 and the remainder is 15 the smaller number is In how many ways the word "KEYBOARD" can be arranged such that the vowels always occupy the odd places.