3 years ago

100 POINTS!!!!!!! I WILL GIVE BRAINLIEST!

Mathematics

1 answer:

abruzzese [7]3 years ago

3 0

Answer:

8.4 miles

Step-by-step explanation:

Let the speed in the morning be s, then in the evening it is s - 4

The distance is equal both directions:

45 min *s = 1 hr 10 min *(s - 4)

Time in hours:

45*1/60*s = (1 + 10*1/60)(s - 4)
3/4s = 7/6s - 7/6*4

Multiply all terms by 12 to clear fraction:

9s = 14s - 56
5s = 56
s = 56/5
s= 11.2 mph

The distance is:

3/4*11.2 = 0.75*11.2 = 8.4 miles

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