deepest swimming pool in the world

Name the deepest mine of the world.

find the in which parts is error Children are not allowed to use the swimming pool unless they are with an adult.

A girl sees through a circular glass slab (refractive index 1.5 ) of thickness 20 mm and diameter 60 cm to the bottom of a swimming pool. Refractive index of water is 1.33 . The bottom surface of the slab is in contact with the water surface. The depth of swimming pool is 6m. The area of bottom of swimming pool that can be seen through the slab is approximately -

A bird is flying over a swimming pool at a height of 2m from the water surface. If the bottom is perfectly plane reflecting surface and depth of swimming pool is 1m, then the distance of final image of bird from the bird itself is mu_w=4//3

Tap A can fill an empty swimming pool in 10 h. Tap B can fill it in 15 h. How much time will the two taps take to fill the empty pool together?

Tap A can fill an empty swimming pool in 10 h. Tap B can fill it in 15 h. How much time will the two taps take to fill the empty pool together?