A motor bike can run for 10 minutes on $.30 worth of fuel. How long could it run on

$1.05 worth of fuel?

Every $0.30 You can run 10 minutes, so just round it up. $0.60 = 20, $0.90 = 30.

If we divide we can go ahead and say every $0.1 is about 6 seconds, so, what would your answer be if $0.1 = 6 seconds? 35 Minutes.

30 x 3.5 = 105

10 x 3.5 = 35

The answer is 35 minutes.