# Yesterday, Christine went on a bike ride. Her average speed was 10 miles per hour. Today, she went on another ride, this time averaging 13 miles per hour. In the two days, she biked for a combined total time of 11 hours. Let x be the number of hours she biked yesterday. Write an expression for the combined total number of miles she biked in the two days.

Yesterday, Christine went on a bike ride. Her average speed was 10 miles per hour. Today, she went on another ride, this time averaging 13 miles per hour. In the two days, she biked for a combined total time of 11 hours. Let x be the number of hours she biked yesterday. Write an expression for the combined total number of miles she biked in the two days.
You can still ask an expert for help

• Questions are typically answered in as fast as 30 minutes

Solve your problem for the price of one coffee

• Math expert for every subject
• Pay only if we can solve it

Malcolm Good
x+y = 11
y = 11-x
10*x + 13*y
= 10x + 13(11-x)
###### Not exactly what you’re looking for?
Ebone6v
Yesterday she bicycled for x hours at a speed of 10 miles per hour.
Today she bicycled the remainder of 11 hours (11-x) at a speed of 13 miles per hour.
10 mi/hour * x hours + 13 mi/hour * (11-x) hours = 10*x mi + 143 mi - 13*x mi
Combining like terms, she rode a total of 143 - 3 * x miles