Question

superman can fly at a rate of 60 miles per 4 minutes. At this rate, how long will it take superman to go from metropolis to gotham city which is a total of 340 miles

Answer 1

This is a proportion problem involving cross multiplication.
$\frac{60}{4}$  =  $\frac{340}{x}$

Now first multiply 340 x 4 which equals 1,360
Now divide that number by 60 to get your X value
Answer is 22.67 minutes or 23 if it needs to be rounded (that depends on your teacher).