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Two trains running in the opposite directions cross each other in 12 seconds and they take 60 seconds when they run in the same direction. The possible speeds ( m/s) of these two trains can be :
दो रेलगाड़ियां विपरीत दिशा में चलते हुए एक दूसरे को 12 सेकंड में पार करती हैं, और समान दिशा में चलने पर वे 60 सेकंड का समय लेती हैं | दोनों रेलगाड़ियों की संभावित गतियां (m/sec में) हो सकती हैं

A

1)18, 40

B

2)15, 45

C

3)20, 30

D

4)15, 30

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