SOLUTION: John and Jack walk towards each other at the same time from two places that are 100km apart. John walks at 6km/h and Jack 4kn/h. John has a dog that runs at 10km/h and starts toget
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Question 687419: John and Jack walk towards each other at the same time from two places that are 100km apart. John walks at 6km/h and Jack 4kn/h. John has a dog that runs at 10km/h and starts together with him. The dog turns back each time when it meets Jack or John. How long has the dog run when these two guys meet each other?
Vezi traducerea Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! John and Jack walk towards each other at the same time from two places that are 100km apart.
John walks at 6km/h and Jack 4kn/h.
John has a dog that runs at 10km/h and starts together with him.
The dog turns back each time when it meets Jack or John.
How long has the dog run when these two guys meet each other?
:
Let t = time John and Jack walked when they meet
:
Write distance equation, dist = speed * time
:
John's dist + Jack's dist = 100 km
6t + 4t = 100
10t = 100'
t = 100/10
t = 10 hrs
:
The dog ran for 10 hrs, his speed is 10 km/hr, therefore
10 * 10 = 100 km was the dist ran by the dog
