4. Two engineers that are ex-lovers having their mountain trek decided to spent their closure at Mountain X having a height of 1.040 km from the ground. Now when they reached the peak of the Mountain X, they observed another Mountain "Y" across. It has angle of elevation of 10 degrees from Mountain X. Suddenly, a helicopter was flying in top of them and saw that the passenger of it was the present lover of the woman. The present lover boy got depressed and instead of flying away, he just sighted and get the angle of depression of Mountain Y which is said to be 46 degrees 12 minutes. The elevation of the helicopter is 2.820 km from the ground. What is the elevation at Mountain Y?

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