A car takes 15 minutes less to cover ...

A car takes 15 minutes less to cover a distance of 75 km, if it increases its speed by10 km/hr from its usual speed. How much time would it take to cover a distance of 300 km using this speed? `5\ hou r s` b. `5 1/2hou r s` c. `6\ hou r s` d. `8` 6 `1/2` hours

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