Official Explanation

Strategize: Choose from the available options the expression that yields the intended value.

RO1, Liters of fuel in 1 hr: Strategize

The Quasi JX travels E kilometers per liter of fuel \((E\frac{km}{L})\) at S kilometers per hour \((S\frac{km}{hr})\). Therefore the Quasi JX requires \(\frac{1}{E}\) liters of fuel to travel 1 km. Since the Quasi JX travels S kilometers per hour, it requires \(\frac{1}{E}\) \(\frac{L}{km}\) × S \(\frac{km}{hr}\), or \(\frac{S}{E} \frac{L}{hr}\)

The correct answer is A, \(\frac{S}{E}\).

RO2, Liters of fuel in 60 km: Strategize

The Quasi JX travels E kilometers per liter of fuel \((E\frac{km}{L})\). Therefore the Quasi JX requires \(\frac{1}{E}\) liters of fuel to travel 1 km. Given this, the Quasi JX uses 1/E L/km × 60 km, or 60/E L of fuel to travel 60 km.

The correct answer is C, \(\frac{60}{E}\)