Correct Answer - Option 3 : 25 metres
Given:
The speed of the first boat = 36 km/h
The speed of the second boat = 54 km/h
Formula used:
\(S\ =\ {D\over T}\) (Where, S = The speed, D = The distance, and T = The time)
Calculation:
Let be assume they will collide in T time and the distance between them is D
⇒ The relative speed of both boats = 36 + 54 = 90 km/h = 90 × (5/18) = 25 m/s
⇒ Now, we can see that both boats will cover 25 m distance in a second then,
⇒ The required distance = 25 m
∴ The required result will be 25 m.
The relative speed of the two trains when running opposite directions = The sum of the speed of the trains
The relative speed of the two trains when running the same direction = The difference in the speed of the trains