The ratio between the speed of travel and the speed on the distance AB is: 30:45 = 2/3.Because the same way so the speed and time are two quantities inversely proportional to each other. Thus the ratio of time travel and time is 3/2.We have a site map:Time to go from A to B is: 40 x 3 = 120 (seconds). 120 change minutes = 2 hours The distance AB is: 30 x 2 = 60 (km) Solution: 60 km
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