Why did Andy feel like he and Rob were being watched at the store?

Hi there!

Accr'ding to question :-
Karl rides his bicycle 120 feet in 10 seconds.

∵ 10 seconds = 120 feet

Multiplying 6 both th' sides :-

=> 6 × 10 seconds = 6 × 120 feet

=> 60 seconds = 720 feet.

∴ Karl rides 720 feet in a minute

• In a minute, there are 60 seconds

Hence,
Option [ C. ] - 720 feet is Correct.

~ Hope it helps!