A plane set off to burbank at a speed of 215 mph. On the return flight of 13 hours, the plane cruised at 237 mph. How many hours was the flight to Burbank?

I just need the equation

It seems you need 2 equations:

We first must solve for: distance = rate * time

Using return flight dа ta: distance = 237 * 13 = 3,081 miles

Then, using flight TO Burbank dа ta: time = distance / rate

time = 3,081 / 215 time = 14.3302325581 hours