| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
How many hours does it take a car to travel 210 miles at an average speed of 70 miles per hour?
| 8 hours | |
| 3 hours | |
| 1 hour | |
| 2 hours |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)Solving for time:
time = \( \frac{\text{distance}}{\text{speed}} \)
time = \( \frac{210mi}{70mph} \)
3 hours
What is \( \frac{3}{7} \) ÷ \( \frac{4}{7} \)?
| \(\frac{1}{16}\) | |
| \(\frac{4}{35}\) | |
| \(\frac{3}{4}\) | |
| \(\frac{1}{36}\) |
To divide fractions, invert the second fraction and then multiply:
\( \frac{3}{7} \) ÷ \( \frac{4}{7} \) = \( \frac{3}{7} \) x \( \frac{7}{4} \)
To multiply fractions, multiply the numerators together and then multiply the denominators together:
\( \frac{3}{7} \) x \( \frac{7}{4} \) = \( \frac{3 x 7}{7 x 4} \) = \( \frac{21}{28} \) = \(\frac{3}{4}\)
| 4.0 | |
| 1.2 | |
| 1 | |
| 0.5 |
1
If a car travels 220 miles in 4 hours, what is the average speed?
| 55 mph | |
| 45 mph | |
| 35 mph | |
| 20 mph |
Average speed in miles per hour is the number of miles traveled divided by the number of hours:
speed = \( \frac{\text{distance}}{\text{time}} \)A menswear store is having a sale: "Buy one shirt at full price and get another shirt for 40% off." If Monty buys two shirts, each with a regular price of $12, how much money will he save?
| $0.60 | |
| $1.20 | |
| $4.80 | |
| $5.40 |
By buying two shirts, Monty will save $12 x \( \frac{40}{100} \) = \( \frac{$12 x 40}{100} \) = \( \frac{$480}{100} \) = $4.80 on the second shirt.