Michael is going to the store 6 miles away. he rides his bike at 12 mph for the first half of the trip, then walks at 4 mph for the remainder. michael's average speed for the trip to the store is closest to:

6 mph

Explanation:

Total distance = 6 miles

Speed for the first half that means first 3 miles is 12 mph.

Speed for the next half that means next 3 miles is 4 mph.

Let t1 be the time taken to go for first half and then t2 be the time taken to go second half

By the use of formula for time.

time = distance / speed

total time taken in the 6 miles

Average speed is defined as the ratio of total distance traveled to the total time taken.

So, Average speed in the entire journey is given by

its c i just checked it