How many times larger is 2×10^15 than 4×10^9

Plz me plzzzzzzz i need and plz delte this after answer

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?