Two cars started from a particular spot. The car A ran straight at the speed of 30 kmph for 2 hours north and then took a right turn. It ran 40 km and again turned right. It stopped after 30 km. The car B ran straight towards east at the speed of 20 kmph for 2 hours and turned left. It ran for 10 km and then stopped. How far were these two cars from each other when both of them stopped at last?

• A. 17 km
• B. 18 km
• C. 19 km
• D. 20 km