Answer: 1846[
Explanation:
Given : The number of times the wings of some humming birds beat in each second = 52
If a hummingbird hovers for 35.5 seconds then , the number of times the wings of humming birds beat in 35.5 seconds will be the product of 52 and 35.5
i.e.

Hence, the wings of humming bird beats 1846 times in 35.5 seconds when hovering.