Two cars A and B 250km apart are travelling towards each oth
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Two cars A and B 250km apart are travelling towards each other on the same road.The travelling speed of car B is 5km/h more than 5/7 of the speed of car A.They will meet after 2 hours.Find the travelling speed of each car.
是怎麼计算~不是翻译
是怎麼计算~不是翻译
set the speed of car A to x km/h
so the speed of car B is (5/7)x+5 km/h
250=(x+(5/7)x+5)*2
x=70
so the speed of car A is 70 km/h
and the speed of car B is 5/7*70+5=55km/h
so the speed of car B is (5/7)x+5 km/h
250=(x+(5/7)x+5)*2
x=70
so the speed of car A is 70 km/h
and the speed of car B is 5/7*70+5=55km/h
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