SOLUTION: A marine platoon went on a 20 mile hike that took 6 hours to complete. for the first 12 miles the platoon hiked at a constant speed. For the last 8 miles he increased his speed b

Question 314312: A marine platoon went on a 20 mile hike that took 6 hours to complete. for the first 12 miles the platoon hiked at a constant speed. For the last 8 miles he increased his speed by 1 mph. find the speed for the last part of the hike.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate*Time=Distance

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You also know that

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From above,

Substitute,

Two solutions but only positive solution makes sense in this problem.

Then from above,

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