Two cars A and B are running at velocities of 60 km $h^{- 1}$ and 45 km $h^{- 1}$ . What is the relative velocity of car A with respect to car B, if both are moving eastward?

15 km

h^{- 1}

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45 km

h^{- 1}

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60 km

h^{- 1}

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105 km

h^{- 1}

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Solution

The correct option is B 15 km $h^{- 1}$
Since both are moving eastwards
$V_{A} = + 60 k m / h V_{B} = 45 k m / h$
Relative speed $V_{A B} = 60 - 45 = 15 k m / h$

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