Commodity and passenger trains move in opposite directions moving off from each other. Speed commodity poyeza45kmch, and speed passenger on 23 kmch is more. Now between them 10 km. What between them there will be a raasstoyaniye in 3.5 hours Help to solve)

45+23=68km/hour speed passenger 45+68=113km/hour removal speed 113*3.5=395.5km will pass in 3.5 hours 395.5+10=405.5km distance between them in 3.5 hours
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