self Maths Puzzle

Find the next term..

7, 35, 322, 2373, _ ?

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self Other Question

Two boats, one running upstream and the other downstream from points A to B meet after 10 seconds. It is known that one boat has moved 60 m more than the other. If the speed of the stream is 2 m/sec then what is the difference in the speeds of the two boats? what power of 15 divides 87! exactly?