Discussion
Two trains are travelling in opposite direction towards each other at 25 km/hr and 30 km/hr with 385 km apart. Find after how much time will they meet?
Answer: A
When two trains move towards each other on parallel tracks, their relative speed is the sum of their speeds.
\[ 25 + 30 = 55\ \text{km/hr} \]
They meet when together they have covered the 385 km between them.
\[ t = \frac{385}{55} = 7\ \text{hr} \]
The value of 7.5 hr, 8 hr or 8.5 hr would need a smaller relative speed than 55 km per hour. The answer is 7 hr, option A.
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