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

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

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