Question

Nolan rides his bike 63 miles in 270 minutes. What is his average speed in miles per hour?

Answer 1

270 minutes = 4,5 hours = 4 hours and 30 minutes
60 minutes = 1 hour

63 miles per 270 minutes
x miles per 1 hour = 60 minutes

$\dfrac{63[miles]}{x[miles]} = \dfrac{270[minutes]}{60[minutes]}$

$63 \cdot 60 = 270x$
$3780 = 270x\quad |:270$
$x=14[miles]$

His average speed is 14 miles per hour. 

:)