To have an average speed of 70 mph over 5 hours he needs to travel 70*5=<<70*5=350>>350 miles.

He drove 60*3=<<60*3=180>>180 miles in the first 3 hours

He needs to travel another 350-180=<<350-180=170>>170 miles over the next 2 hours.

His speed needs to be 170/2=<<170/2=85>>85 mph

# Answer

85
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A man drives 60 mph for 3 hours.  How fast would he have to drive over the next 2 hours to get an average speed of 70 mph?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
85
A man drives 60 mph for 3 hours.  How fast would he have to drive over the next 2 hours to get an average speed of 70 mph?
train