Question

Enrique is driving to texas. he travels at 70 kilometers per hour for 2 hours, and 63 kilometers per hour for 5 hours. over the 7 hour time period what was enrique's average speed?

Answer 1

To solve this problem, we know that the formula for average speed is:

average speed = total distance travelled / total time

 

Now let us first calculate for the total distance travelled. Calculating:

total distance travelled = (70 km / hr) * 2 hr + (63 km / hr) * 5 hr

total distance travelled = 140 km + 315 km

total distance travelled = 455 km

 

Now for the total time:

total time = 2 hours + 5 hours

total time = 7 hours

 

Hence, the average speed is therefore:

average speed = 455 km / 7 hours

average speed = 65 km / hr

Answer 2

The answer is 65 km/h

To solve you do $Avg Speed = \frac{Total Distance}{Total Time}$

$Total Distance:$

$=2(70)+5(63)$

$=140+315$

$=455 km$

$Total Time:$

$=7 hours$

$Average Speed:$

$=455$÷$7$

$=65 km/h$