Question

Determine the distance covered by the dog in 2 hours and 30 minutes if the dog's speed is 15 km/h faster than the cow's. The time it takes for the cow to cover 210 km is 3 hours less than the time it takes for the dog to cover 450 km.

A 150 km
B 665 km
C 250 km
D 320 km
E can't be determinded
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