If a bicyclist travels 3 miles in 15 minutes, how far will he travel in 25 minutes maintaining a constant speed?

The only way this boy maintain a constant speed is on a bike in the gym! 

 But hey - never mind the details let’s get on with the question.

If you’re not good with numbers - the best thing to do before you start is think about the question and have an idea of what the answer is going to look like - so...

If the boy travels 3 miles in 15 minutes if you double that he will travel 6 miles in 30 minutes.

But we only want to know the answer if he keeps going for 25 minutes - we know its going to be a little bit less than six miles

15 minutes for 3 miles - how long for 1 mile? -15 minutes divided into 3 equal parts = 5 mins

The boy goes 1 mile in 5 minutes so he will go 5 miles in 25 minutes.