Stu trained for a triathlon for 5 hours yesterday. he ran 5 miles and then biked 80 miles. his biking speed is 15 mph faster than his running speed. what is his running speed?

Step-by-step explanation:

Given as :

The distance cover while running = = 5 miles

Let The speed for running =

The distance cover with bike = = 80 miles

The speed for biking = = 15 mph +  

Total Time taken = 5 hours

Now Time =

∴ 5 hour = +  

Or,  5 hour = +  

Or, 5 hour =

or,  5 × () =

Or, -   = 0

or, = 0

or,   = 0

Or, = 0

Or, = 0

Or, = 0

∴ = 3 , - 5

So, the running speed = 3 mile per hour

And the biking speed = 15 mph + 3 mph = 18 mile per hour

Hence The running speed of Stu is 3 mile per hour  .  Answer

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