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## Homework Statement

## Homework Equations

D = rt

## The Attempt at a Solution

I let d to be the total distance

d/3a = t1 ----- time taken for 1st part of the trip

d/3b = t2 ----- time taken for 2nd part of the trip

d/3c = t3 ------ time taken for the whole trip with uniform speed

Since t1+t2 =t3

d/3a + d/3b = d/3c

Multiplying both sides by 3abc

bcd + acd = abd

Dividing both sides by d

bc + ac = ab

Factoring out c and diving both sides by it.

1/c = (a + b)/ab = 1/a + 1/b

1/c =

**1/a + 1/b not the same as**[/B]

**2/c =****1/a + 1/b**

Do you think it is just a typo?Do you think it is just a typo?