Question 1197634
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There are two issues:<ol><li>You posted multiple problems. Ideally you should post one at a time.</li><li>The questions 2 through 5 are incomplete, which makes them impossible to answer.</li></ol>But I do appreciate you showing your work and thought process on problem 1.
It is a correct line of thinking.


x = distance it travels using 240 L of gasoline


(140 L)/(680 km) = (240 L)/(x km)
140/680 = 240/x
140x = 680*240 .... cross multiply
x = 680*240/140
x = 1165.71428571429
which is approximate. Round that however you need to.
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