If it took 5 hours to travel 90 kilometers, then at that rate, how many kilometers would be traveled in 15 hours?

90 kilometers = 5 hours so multiply 5 x 3 = 15 so 90 x3 = 270

The answer to your question is 270 kilometers. Why is it 270 kilometers?

5/90 & 15/x

x=kilometers

Numerator (Number on top) : 5 x 3=15

Denominator (Number on the bottom) 90 x 3 = 270

So 270 kilometers is your answer.