Yesterday, Maria went on a bike ride. Her average speed was 10 miles per hour. Today, she went on another ride, this time averaging 14 miles per hour. In the two days, she biked for a combined total time of 10 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.

Question

Yesterday, Maria went on a bike ride. Her average speed was 10 miles per hour. Today, she went on another ride, this time averaging 14 miles per hour. In the two days, she biked for a combined total time of 10 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.

alexandervonhumboldt2 · Answer

s=v*t  where s is distance, v is speed and t is time. 
10*x+14*(10-x)=S
s=140-4x