Two cars are moving in the same direction with the same speed of \( 30 \mathrm{~km} / \mathrm{h}...

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Two cars are moving in the same direction with the same speed of \( 30 \mathrm{~km} / \mathrm{h} \). They are separated by 5 \( \mathrm{km} \). What is the speed of a car moving in the - opposite direction if it meets the two cars at an - interval of 4 minute?
- (1) \( 45 \mathrm{~km} / \mathrm{h} \)
(2) \( 60 \mathrm{~km} / \mathrm{h} \)
(3) \( 105 \mathrm{~km} / \mathrm{h} \)
(4) None
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