Ques:- The time taken by a train 180 m long, travelling at 42 kmph, in pasing a person walking in the same direction at 6 kmph, will be
A. 16 sec
B. 18 sec
C. 21 sec
D. 24 sec
Ques:- The largest natural number which exactly divides the product of any four consecutive natural numbers is
A. 6
B. 12
C. 24
D. 120