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Workings

Hint
It doesn't matter how far it was to Manchester, so you can use any distance.

Answer
Billie.

Reasoning
If we call the one way distance T, we know that:

On the way there, Alex drove 90 miles, and Billie drove (T – 90) miles.

On the way back, Alex drove (T – 100) miles, and Billie drove 100 miles.

So, in total, both ways:

   Alex drove 90 + (T – 100)
      = T – 10

   Billie drove (T – 90) + 100
      = T + 10

Therefore, Billie drove 20 miles more than Alex.

Workings

Hint
How can we write this time and date?

Answer
The time and day became:

12:34 5/6/78 (in UK format)

In US format, this happened on the 6^th of May.

Workings

Hint
The highest total does not involve a 4.

Answer
13.

Workings

Hint
There are 3 feet in a yard, 1760 yards in a mile, and 8 furlongs in a mile.

Answer
Square feet in half a square mile.

Reasoning
There are 3 feet in a yard, 1760 yards in a mile, and 8 furlongs in a mile.

A mile is 1760 x 3 = 5280 feet in a mile.

A square mile is 5280 x 5280 = 27878400 square feet.

Therefore, half a square mile = 13,939,200 square feet.

A furlong is 1760 ÷ 8 = 220 yards.

Therefore, a cubic furlong is 220 x 220 x 220 = 10,648,000 cubic yards.