UP Police Constable Exam Model Paper 3

Given:
Speed of A = 9 km/h = 9 × (5/18) = 2.5 m/s
Speed of B = 27 km/h = 27 × (5/18) = 7.5 m/s
Formula Used:
Time = Distance/Speed
When two bodies are moving in opposite directions, their relative speed = sum of individual speeds
Calculation:
Relative speed between A and B = 7.5 + 2.5 = 10 m/s
∴ Time taken by them to meet each other = 2400/10 = 240 seconds