Two boat are travelling with speed of 36 km hr and...

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Two boat are travelling with speed of 36 km/hr and 54 km/hr respectively towards each other. What is the distance (in metres) between the two boats one second before they collide?

A. 10

B. 15

C. 25

D. 5

Answer: Option C

\begin{array}{l} \frac{Distance}{Relative Speed} = Time \\ Distance = (36 + 54) \times 1 \\ = 90 \times \frac{5}{18} \times 1 (km/hr \overset{\frac{\times 5}{18}}{\to} m/sec) \\ = 25 metre \end{array}

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