Discussion
Two trains A and B are moving in the same direction. A has speed of 8 km/h and B has speed of 13 km/h. What is relative speed of B with respect to A?
Answer: B
Trains moving in the same direction close at the difference of their speeds; in opposite directions, at the sum.
\[ 13 - 8 = 5 \text{ km/hr} \]
Because they travel the same way, only the excess of B's speed over A's brings them together. In opposite directions the answer would be their sum, 21 km/hr - which is why that value is offered.
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