Question 944334
Mike made a trip in 40 hours. Joe made the same trip in 30 hours because Joe was traveling 6 km per hour faster. How many km was the trip? 
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let x=mike's rate
x+6=Joe's rate
travel time*speed=distance (same for both Mike and Joe)
..
40x=30(x+6)
40x=30x+180
10x=180
x=18
40x=720
How many km was the trip? 720