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what is the remainder of 50!/(16^15)

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TCS Other Question

20th word of PARROT in english dictionary TWO PERSONS are running from A in same direction with the speed 20 km/hr & 15 km/hr respectively. and from the other end another person is running 0in opposite direction with speed 30km//hr.
the total distance is 100 km
at what time will they meet ??