Physics

Problem

79. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60

\mathrm{km} / \mathrm{h}

and the other is moving at

40 \mathrm{~km} / \mathrm{h}

. In how many hours will they meet? (A) 1.5 (B) 1.75 (C) 2.0 (D) 2.5 (A) 1.5 (B) 1.75 (C) 2.0 (D) 2.5