MBA Exam

A start walking from a place at a uniform speed of 2 km/hour
in a particular Direction. After half an hour, B starts from the same Place and
walks in the same direction as A at uniform speed and over takes A after 1 hour
48 min. calculate the speed of B ?Solved Sum from Arun Sharma.. I need If any one can come up with new Approach.

1) 20/9
2) 24/9
3) 21/9
4) 23/9

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MBA Other Question
If N = 1^1 x 2^2 x 3^6 x 4^12 x 5^20...... 25 terms. Then what is the highest power of 75 that completely divides N?

1) 1900
2) 1850
3) 2526
4) 237
5) NOT
 Out of 20 consecutive natural numbers, in how many ways can 4 numbers be selected, such that any two among the selected numbers differ by at least 3?

1) 20C3/3
2) 17C4
3) 23C4
4) 14C4