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**[SOLVED] Average speed**

Hi, Please could someone enlighten me as to how to solve the following, given that the total time of the journey is not given?

A commuter drives to work 14 miles. Due to traffic, the commuter averages 25 miles per hour on the first 7 miles of the drive. How fast must the commuter go on average on the second half to average 40 miles per hour for the entire drive?

Many thanks