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Two trains that are 660 km apart are heading towards each other at 50 km/h and 60 km/h. How many hours will it be before they meet?



Two trains that are 640 km apart are heading towards each other at 60 km/h and 100 km/h. How many hours will it be before they meet?



Two trains that are 1020 km apart are heading towards each other at 70 km/h and 100 km/h. How many hours will it be before they meet?



Two trains that are 320 km apart are heading towards each other at 80 km/h and 80 km/h. How many hours will it be before they meet?



Two trains that are 320 km apart are heading towards each other at 70 km/h and 90 km/h. How many hours will it be before they meet?

Two trains that are 1360 km apart are heading towards each other at 80 km/h and 90 km/h. How many hours will it be before they meet?



Two trains that are 510 km apart are heading towards each other at 80 km/h and 90 km/h. How many hours will it be before they meet?



380 km 떨어진 양쪽 두 도시에서 각각 두대의 기차가 서로를 향해 90 km/h 와 100 km/h의 속도로 달려 오고있다. 두대의 기차가 서로 만나는데 몇시간이 걸리는가?



Two trains that are 320 km apart are heading towards each other at 70 km/h and 90 km/h. How many hours will it be before they meet?



Two trains that are 910 km apart are heading towards each other at 70 km/h and 60 km/h. How many hours will it be before they meet?

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