Two cars are moving in same direction with speed of 30 \( \mathrm{kmh}^{-1} \). They are separat...

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Two cars are moving in same direction with speed of 30 \( \mathrm{kmh}^{-1} \). They are separated by a distance of \( 5 \mathrm{~km} \). What is the speed of a car moving in opposite direction if it meets the two cars at an interval of \( 4 \mathrm{~min} \) ?
(a) \( 60 \mathrm{kmh}^{-1} \)
(b) \( 5 \mathrm{kmh}^{-1} \)
(c) \( 30 \mathrm{kmh}^{-1} \)
(d) \( 45 \mathrm{kmh}^{-1} \)
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