They travelled 551 km from Bagani to Zimbabwe N. R at an average speed of 75km/h and their car has an average petrol consumption of 12 litres per 100 km. calculate the following.

1. the time that it will take them to complete the journey, convert to hours & minutes.

2. the amount that they will spend on petrol if the petrol costs is R7.25 per litre?

A] the time that it will take them to complete the journey, convert to hours & minutes.

Time = (distance) / (speed)

distance=551

speed=75 km/h

thus

time=551/75=7 26/75 hours

=7 hours (26/75 * 60) min

=7 hours 21 min

2] the amount that they will spend on petrol if the petrol costs is R7.25 per litre?

Total amount spent on petrol will be as follows:

Cost of petrol R7.25 per Km

Consumption=12 liters per 100 km

thus amount of liters used:

12/100*551

=66.12 liters

thus total cost of petrol used:

66.12*7.25

=R479.37