Hi,

I have a what seems to be a simple math problem but for some reason the answer key is telling me my answer is incorrect. So here goes...

One motor scooter travels at an average speed of 48 kilometres per hour. A slower scooter travels at an average speed of 36 kilometres per hour. In 45 minutes, how many more kilometres does the faster scooter travel than the slower scooter?

My answer is 9km. I multiplied 48 by .75 which gave me 36. I then multiplied 36 by .75 which gave me 27. I subtracted the 27 from 36 to get the answer of 9. I figure 45 minutes is 3/4 or 75% aka .75 of an hour. Apparently, according to the answer key, the answer is 7.5km. Where did I go wrong?