Question

A truck travels at an average speed of 70 km/hr. If it travels 100 km in the first hour,

how far will it go the second hour of a 2 hour trip?

Answer 1

40km

Step-by-step explanation:

Average speed can be computed with the equation:

`\bar{s} = (total\;distance\;traveled)/(Total\;time\;traveling)`

So we know the average speed and one of the distances is already given and we need to know how much it traveled after that. The total time the car traveling is 2 hours. Let's plug that in our equation:

`(70km)/(hr) = (100km + x)/(2hours)`

Now let's multiply both sides by 2 hours:

`(70km(2hr))/(hr) = 100km + x`

Cancel out the hours and multiply:

`70km(2) = 100km + x`

`140km = 100km + x`

Subtract 100km from both sides of the equation:

`140km - 100km= 100km - 100km + x\\\\40km = x`