Question

David drove a distance (d) of 187km, correct to 3 significant figures.
He used 28 litres of petrol (p) correct to 2 significant figures.
The petrol consumption (c) of a car, in km pet litre, is given by the formula
C = d/p
By considering bounds, work out the value of c for David’s journey to a suitable degree of accuract.
You must show your working and give a reason for your answer

Answer 1

Answer:

Mileage of David's car was 6.68 km/liter

Step-by-step explanation:

David drove a distance by his car (d) = 187 km

He used the amount of petrol (p) = 28 liters

The petrol consumption (C) of a car in km per liter = $\frac{d}{p}$

Consumption = $\frac{187}{28}$

                       = 6.67857 ≈ 6.68 km per liter

Mileage of David's car was 6.68 km/liter

To check :

In 1 liter petrol he traveled = 6.68 km

In 28 liter petrol he traveled = 6.68 × 28

                                               = 187.04 ≈ 187 km

Learn more to calculate mileage of the car : https://brainly.in/question/11641044

Answer 2

Answer:

6.68 km per hour

Step-by-step explanation:

1) Upper bound = 187.5 / 27.5 = 6.82 (2dp)

  Lower bound = 186.5 / 28.5 = 6.54 (2dp)

2) 6.82 - 6.54 = 0.28

3) 0.28 / 2 = 0.14

4) 6.54 + 0.14 = 6.68 km per hour