The distance, d km, travelled by a car is directly proportional to the amount, a litres, of petrol
used. when a = 5, d = 270
a) express d in terms of a.
b) find the value of d when a = 4.5
c) how many litres of petrol are needed for a journey of 324 km?

D=54A

When A is 4.5 D=54×4.5 D=243

324=54×A A=324/54 A=6litre

Step-by-step explanation:

D©A

D=k×A

270=K×5

K=270/5 k=54

D=54×A

When A is 4.5 D=54×4.5 D=243

324=54×A A=324/54 A=6litre

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.