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}.
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?
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