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Dave is walking from the back of a train to the front of the train at a rate of 6 kilometers per hour (km/hr). The train is traveling at a rate of 42 km/hr. What is Dave's speed, relative to the ground?
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Dave is walking from the back of a train to the front of the train at a rate of 6

kilometers per hour (km/hr). The train is traveling at a rate of 42 km/hr. What is
Dave's speed, relative to the ground?

User Thenextmogul
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6.8k points

1 Answer

5 votes
48 km/hr. Because the trains speed remains constant and is unaffected to Dave’s speed and Dave’s speed will remain relative to the trains speed. Taken that, when Dave is moving 0 km/hr he is moving at 42km/hr. So his speed must only add to that.
User Giberno
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