book Maths Puzzle Numerical Ability

THE DISTANCE BETWEEN BOSTON AND CAMBRIDGE IS 10 MILES. A PERSON WALKS 5 MILES PER HOUR, THE JOGS 8 MILES PER HOUR THE REST OF THE WAY. IN FIND THE FORMULA THAT EXPRESSES THE TOTAL

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2) Use the geometric sequence of numbers 1, 2, 4, 8,…to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
Show work in this x+1/ 2 = x+2/ 3