Two cities A and B are apart. Two cars start simultaneously from A and B toward each other with speeds of and . After how many hours will they cross each other?

Answer and explanation

Correct answer: C.

  1. Step 1: Relative speed of two bodies moving in opposite directions toward each other is the sum of their speeds: .
  2. Step 2: Time taken to meet is .
Answer
.
Why not the others: assumes relative speed; uses . does not fit.

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