Ratio: Arrange the numbers in Ascending Order

First calculate the pace for each swimmer. Pace is the time taken per meter.

Swimmer A pace: $\frac{25}{50} = 0.5$ seconds per meter.

Swimmer B pace: $\frac{50}{75} \approx 0.67$ seconds per meter.

Swimmer C pace: $\frac{10}{20} = 0.5$ seconds per meter.

Swimmer D pace: $\frac{80}{100} = 0.8$ seconds per meter.

Swimmers A and C have the fastest pace at 0.5 seconds per meter. After them swimmer B and last swimmer D.

First, let's calculate the speed of each toy car using the formula $\text{Speed} = \frac{\text{Distance}}{\text{Time}}$.

• For Car A: $\text{Speed}_A = \frac{4 \text{ m}}{0.5 \text{ s}} = 8 \text{ m/s}$
• For Car B: $\text{Speed}_B = \frac{3 \text{ m}}{30 \text{ s}} = 0.1 \text{ m/s}$
• For Car C: $\text{Speed}_C = \frac{38 \text{ m}}{4.5 \text{ s}} \approx 8.44 \text{ m/s}$
• For Car D: $\text{Speed}_D = \frac{15 \text{ m}}{2 \text{ s}} = 7.5 \text{ m/s}$

After calculating the speeds, we can order the cars from fastest to slowest by comparing their speeds:

• Car C: 8.44 m/s
• Car A: 8 m/s
• Car D: 7.5 m/s
• Car B: 0.1 m/s

Therefore, the fastest car is Car C, followed by Car A, Car D, and the slowest is Car B.

Thus, the order of the cars from fastest to slowest is:

Car C
Car A
Car D
Car B