Two cars, A and B, are driving in opposite directions at the same time from two places 600 kilometers apart. It is known that car A travels 42 kilometers per hour and car B travels 58 kilometers per hour. How many kilometers did B car travel when they met?

Solution:

Speed sum =42+58= 100 km/h

Meeting time =600/ 100=6 hours.

When they met, B traveled 58×6= 148 km.

or

The speed ratio of car A and car B is 42: 58 = 21:29.

So when we met, B traveled 600×29/(2 1+29)=348 kilometers.

The two cars face each other, meet in 6 hours, and then the bus will arrive in 4 hours, truck 188 km. How far is the distance between the two places?

Solution: treat the two cars as a whole.

65438+ 0/6 of the whole journey of two cars per hour

4 hour line 1/6×4=2/3

Then the whole journey =188/(1-2/3) =188× 3 = 564 km.