1.A family, planning a weekend trip, decides to spend not more than a total of 8 hours driving. By leaving early in the morning, they can average 40 miles per hour on the way to their destination. Due to the heavy Sunday traffic, they can average only 30 miles per hour on the return trip. What is the farthest distance from home they can plan to go?
(a) 120 miles or less (b) Between 120and 140 miles (c) 140 miles
(d) Between 140 and 160 miles (e) 160 miles or more
(Explain with steps)
2. A car is filled with four and half gallons of fuel for a round trip. If the amount of fuel taken while going is 1/4 more than the amount taken for coming, what is the amount of fuel consumed while coming back?
(a) Less than 2 gallons (b) 2 gallons (c) 2 1/2 gallons
(d) 3 gallons (e) More than 3 gallons
(Explain with steps)
3. A 3-gallon mixture contains one part S and two parts R. In ord er to change it to a mixture containing 25% S, how much R should be added?
(a) 1/2 gallon (b) 2/3 gallon (c) 3/4 gallon (d) 1 gallon (e) 1 1/2 gallon
(Explain with steps)