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In the figure, A and B start together from the same point and run in opposite directions. After how many seconds do they first meet?

Competition practiceRaces & Circular Tracks

A144 s
B720 s
C240 s
D96 s

Step-by-Step Solution

A: 18 km/

h = 5

m/s; B: 12 km/

h = \frac{10}{3}

m/s. Sum

= \frac{25}{3}

m/s. Time =

1200 \div \frac{25}{3} = 144

s. (720 s uses the difference.)

Answer: A) 144 s

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