Average speed from a distance and a time

Difficulty Stretch · Set vno44d

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1
A car covers 315 miles in 7 hours. What is its average speed, in miles per hour?
2
A car covers 240 miles in 6 hours. What is its average speed, in miles per hour?
3
A car covers 350 miles in 7 hours. What is its average speed, in miles per hour?
4
A car covers 225 miles in 9 hours. What is its average speed, in miles per hour?
5
A car covers 900 miles in 9 hours. What is its average speed, in miles per hour?
6
A car covers 525 miles in 7 hours. What is its average speed, in miles per hour?
7
A car covers 300 miles in 4 hours. What is its average speed, in miles per hour?
8
A car covers 120 miles in 8 hours. What is its average speed, in miles per hour?
9
A car covers 420 miles in 4 hours. What is its average speed, in miles per hour?
10
A car covers 420 miles in 7 hours. What is its average speed, in miles per hour?
11
A car covers 385 miles in 7 hours. What is its average speed, in miles per hour?
12
A car covers 225 miles in 5 hours. What is its average speed, in miles per hour?
13
A car covers 100 miles in 4 hours. What is its average speed, in miles per hour?
14
A car covers 600 miles in 6 hours. What is its average speed, in miles per hour?
15
A car covers 630 miles in 9 hours. What is its average speed, in miles per hour?
16
A car covers 170 miles in 2 hours. What is its average speed, in miles per hour?
17
A car covers 560 miles in 7 hours. What is its average speed, in miles per hour?
18
A car covers 200 miles in 5 hours. What is its average speed, in miles per hour?
19
A car covers 315 miles in 3 hours. What is its average speed, in miles per hour?
20
A car covers 420 miles in 7 hours. What is its average speed, in miles per hour?

What is in this set

The numbers in this set run from 2 to 1,080.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the two numbers were multiplied; a speed is the distance shared out over the hours, so it is a division.
Answers are a whole number.

Drawing 240 problems from this page produced 133 different ones, 55% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.