Answer:
33 1/3
Step-by-step explanation:
Since 20 is double the amuont of 10 then Han's distance will be 2/3 of 1000 feet which is 666 2/3 and Clare would travel the rest (333 1/3) then you have to divide one of those big numbers (lets do 333 1/3) by there paired number (10). 333 1/3 / 10 = 33.3333 or 33 1/3