631  Speed
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Two trains that are 640 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 640 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 640 km apart are heading towards each other at 90 km/h and 70 km/h. How many hours will it be before they meet?



Two trains that are 650 km apart are heading towards each other at 60 km/h and 70 km/h. How many hours will it be before they meet?



Two trains that are 600 km apart are heading towards each other at 70 km/h and 50 km/h. How many hours will it be before they meet?

Two trains that are 770 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 510 km apart are heading towards each other at 90 km/h and 80 km/h. How many hours will it be before they meet?



Two trains that are 1800 km apart are heading towards each other at 100 km/h and 100 km/h. How many hours will it be before they meet?



Two trains that are 1440 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 760 km apart are heading towards each other at 100 km/h and 90 km/h. How many hours will it be before they meet?

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