Bunuel wrote:

A bird leaves its nest, and flies back and forth from its nest to a nearby ditch to gather worms. The distance between the nest and the ditch is 200 meters. In one and a half hours, the bird manages to bring worms to its nest 15 times. What is the speed of the bird in kilometers per hour?

A. 1

B. 2

C. 4

D. 5

E. 6

The distance between the nest and the ditch is 200 meters.

15 times mean = A bird leaves its nest, and flies back ( going and coming back) i.e. 2 times we get total 30 rounds.

So the distance is 30 * 200 = 6000.

D = ST

6000/1.5 = T , I think we can take 6000 meters as 6 km, then only we get T = 4.

( 1000 meters = 1 km)