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In covering a certain distance, the s...

In covering a certain distance, the speeds of A and B are in the ratio of 3:4. A takes 30 minutes more than B to reach the destination. The time taken by A to reach the destination is `1\ hou r` b. `2\ hou r s` c. `1 1/2hou r s` d. `2 1/2hou r s`

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