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Properties of Measures of Central Tendency

Two parallel ...

Question

Two parallel rail tracks run north-south. Train $A$ moves north with a speed of $54 k m h^{- 1}$ and train $B$ moves south with a speed of $90 k m h^{- 1}$ . The relative speed of $B$ with respect to $A$ is:

A

40 {m s}^{- 1}

(towards north)

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B

40 {m s}^{- 1}

(towards south)

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C

10 {m s}^{- 1}

(towards north)

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D

10 {m s}^{- 1}

(towards south)

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Solution

The correct option is B $40 {m s}^{- 1}$ (towards south)
Velocity of train B with respect to A is $v_{B A} = v_{B} - v_{A}$
$v_{B A} = 25 - (- 15) = 40 m / s$ due south

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