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Two trains are coming from opposite dire...

Two trains are coming from opposite directions with speeds of 75 km/hr and 100 km/hr on two parallel tracks. At some moment the distance between them is 100 km. After T hours, distance between them again 100 km. T is equal to `1\ h r` b. `1 1/7h r` c. `1 1/2h r` d. `2\ h r s`

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