To solve this set of questions, we need to calculate the time it takes for each vehicle, bird, or object to travel a given distance at a given speed. The formula for time is:

$\text{Time} = \frac{\text{Distance}}{\text{Speed}}$

I will now calculate the time taken for each part:

(a) Car:

• Distance = 100 miles
• Speed = 40 mph $\text{Time} = \frac{100 \text{ miles}}{40 \text{ mph}} = 2.5 \text{ hours}$

(b) Lorry:

• Distance = 90 miles
• Speed = 60 mph $\text{Time} = \frac{90 \text{ miles}}{60 \text{ mph}} = 1.5 \text{ hours}$

(c) Bus:

• Distance = 60 miles
• Speed = 48 mph $\text{Time} = \frac{60 \text{ miles}}{48 \text{ mph}} = 1.25 \text{ hours}$

(d) Helicopter:

• Distance = 105 km
• Speed = 140 km/h $\text{Time} = \frac{105 \text{ km}}{140 \text{ km/h}} = 0.75 \text{ hours}$

(e) Bird:

• Distance = 95 miles
• Speed = 20 mph $\text{Time} = \frac{95 \text{ miles}}{20 \text{ mph}} = 4.75 \text{ hours}$

(f) Car:

• Distance = 110 miles
• Speed = 50 mph $\text{Time} = \frac{110 \text{ miles}}{50 \text{ mph}} = 2.2 \text{ hours}$

(g) Lorry:

• Distance = 452.4 km
• Speed = 52 km/h $\text{Time} = \frac{452.4 \text{ km}}{52 \text{ km/h}} \approx 8.7 \text{ hours}$

(h) Bird:

• Distance = 80 miles
• Speed = 15 mph $\text{Time} = \frac{80 \text{ miles}}{15 \text{ mph}} \approx 5.33 \text{ hours}$

(i) Ship:

• Distance = 208 miles
• Speed = 24 mph $\text{Time} = \frac{208 \text{ miles}}{24 \text{ mph}} \approx 8.67 \text{ hours}$

(j) Jet:

• Distance = 2088 km
• Speed = 480 km/h $\text{Time} = \frac{2088 \text{ km}}{480 \text{ km/h}} = 4.35 \text{ hours}$

(k) Racing Car:

• Distance = 256 miles
• Speed = 120 mph $\text{Time} = \frac{256 \text{ miles}}{120 \text{ mph}} \approx 2.13 \text{ hours}$

(l) Helicopter:

• Distance = 764 km
• Speed = 80 km/h $\text{Time} = \frac{764 \text{ km}}{80 \text{ km/h}} \approx 9.55 \text{ hours}$

Summary of Time Taken:

1. Car (a): 2.5 hours
2. Lorry (b): 1.5 hours
3. Bus (c): 1.25 hours
4. Helicopter (d): 0.75 hours
5. Bird (e): 4.75 hours
6. Car (f): 2.2 hours
7. Lorry (g): 8.7 hours
8. Bird (h): 5.33 hours
9. Ship (i): 8.67 hours
10. Jet (j): 4.35 hours
11. Racing Car (k): 2.13 hours
12. Helicopter (l): 9.55 hours

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Would you like more details on any part of the calculations? Here are some related questions:

1. What happens if the speeds of the vehicles change?
2. How would different units (e.g., kilometers per hour vs miles per hour) affect the calculations?
3. How would you calculate the average speed if all vehicles traveled the same total distance?
4. How does fuel consumption relate to speed and time of travel?
5. What impact do varying weather conditions have on time of travel?

Tip: Always ensure that the units for distance and speed match when calculating time, or convert them appropriately before applying the formula.