Two trains, each 50 m long, approach each other on parallel rails with speeds 10 m s⁻¹ and 15 m s⁻¹. They completely cross each other in:
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Two trains, each 50 m long, approach each other on parallel rails with speeds 10 m s⁻¹ and 15 m s⁻¹. They completely cross each other in:
Options