Question
Asked Oct 18, 2019

Kirks average driving speed is 7km/hr, faster than Thors. In the same length of time it takes Kirk to drive 450km, Thor drives only 408 kilometers. What is Kirk's average speed?

check_circleExpert Solution
Step 1
Let the driving speed of Thor is x
So, the driving speed of Kirk is x +7.
The distance Kirk travelled is 450 kilometre and Thor travelled 408 kilometre at a same
time length
distance
So, the formula for time is T =
speed
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Let the driving speed of Thor is x So, the driving speed of Kirk is x +7. The distance Kirk travelled is 450 kilometre and Thor travelled 408 kilometre at a same time length distance So, the formula for time is T = speed

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Step 2
Find the average speed of Thor as follows.
408
450
x+7
450x-408 (x + 7
450x 408x2,856
450x 408x 2,856
On further simplification
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Find the average speed of Thor as follows. 408 450 x+7 450x-408 (x + 7 450x 408x2,856 450x 408x 2,856 On further simplification

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