Question

I have 1 question I just can't seem to solve:A rabbit and a tortoise started walking from the same place at the same time. The rabbit walked to the east for 3 hours at a speed of 20m/h and took a rest for 1 hour. Then it walked to the west for 2 hours at a speed of 15m/h. The tortoise walked to the east for 6 hours at a speed of 6m/h. Let the east be the positive direction.
Find the distance between the rabbit and the tortoise after 6 hours.
rabbit: 3*20 + 1*0 - 2*15 = 30
tortoise: 6*6 = 36

So, after 6 hours, the tortoise is 6 miles east of the rabbit.

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