He would walk 2.125 miles or 2 1/8 miles in one hour

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Define their age

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Let Jim be x years old

Jim = x

Father = x + 31 ← Jim is 31 years younger than the father

Grandfather = x + 70 ← Grandfather is 70 years older than Jim

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Combined age is 137, find x

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x + (x + 31) + (x + 70) = 137

x + x + 31 + x + 70 = 137

3x + 101 = 137

3x = 137 - 101

3x = 36

x = 12

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Find their age

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Jim = x = 12

Father = x + 31

Father = 12 + 31

Father = 43

Grandfather = x + 70

Grandfather = 12 + 70

Grandfather = 82

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**Answer: Jim = 12 ; Father = 43 ; Grandfather = 82**

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25 & 30

25x30=750

25 w 30 l

sorry i put so much, i had to in order to answer for you