A car uses petrol at the rate of 1litres per 7km traveled. if the cost of the petrol was 14 naira, what was the cost of petrol for a journey of 245km?
To find the cost of petrol for a journey of 245 km, we need to find out how many liters of petrol will be consumed for this distance.
The car uses petrol at a rate of 1 liter per 7 km traveled. So for 245 km, it will consume 245/7 = <<245/7=35>>35 liters of petrol.
And if the cost of petrol is 14 naira, the cost of petrol for a journey of 245 km will be 35 * 14 = <<35*14=490>>490 naira. Answer: \boxed{490}.
To calculate the cost of petrol for a journey of 245 km, we need to determine how many liters of petrol will be used and then multiply it by the cost per liter.
Given that the car uses petrol at the rate of 1 liter per 7 km traveled, we can calculate the liters of petrol used for the journey by dividing the distance traveled by the rate:
Liters of petrol used = Distance traveled / Rate of petrol consumption
= 245 km / 7 km per liter
= 35 liters
The cost of petrol for the journey can be calculated by multiplying the liters of petrol used by the cost per liter:
Cost of petrol = Liters of petrol used * Cost per liter
= 35 liters * 14 naira per liter
= 490 naira
Therefore, the cost of petrol for a journey of 245 km would be 490 naira.