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

The answer is 65 km/h

To solve you do
`Avg Speed = (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`

Answer 2

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