A stone is dropped from a height ℎ. Simultaneously, another stone is thrown up from the ground which reaches a height 4 ℎ. The two stones cross other after time

A stone is dropped from a height ℎ. Simultaneously, another stone is thrown up from the ground which reaches a height 4 ℎ. The two stones cross other after time

Question : A stone is dropped from a height ℎ. Simultaneously, another stone is thrown up from the ground which reaches a height 4 ℎ. The two stones cross other after time