A friendly race

Algebra Level pending

Andy and Boris have the same walking speed.

They decide to have a race.

Andy walks the entire way,and finishes in exactly 3 hrs ( = 180 minutes.)

Boris covers the first half of the distance on horse (at 6 times his walking speed), and the second half of the distance on mule (at half his walking speed: it's a very stubborn mule.)

How many minutes does it take Boris to finish the race?

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