Solve each problem. (2 pts. Each)
Rose types 400 words in 8 minutes. Find the unit rate.
It took Joana 70 seconds to finish the entrance examination. The same examination took Janssen 3 minutes to finish. Find the ratio of Janssen’s time to Joana’s time.
The average speed of a car for the first 3 hours is 80 kph. Its average speed for the next 2 hours is 60 kph. Find its average speed for the whole trip.
With Solutions Please
Rose types 400 words in 8 minutes. Find the unit rate.
It took Joana 70 seconds to finish the entrance examination. The same examination took Janssen 3 minutes to finish. Find the ratio of Janssen’s time to Joana’s time.
The average speed of a car for the first 3 hours is 80 kph. Its average speed for the next 2 hours is 60 kph. Find its average speed for the whole trip.
With Solutions Please
Answers & Comments
1. Final Answer is 50 words/minute
[tex] \frac{400 \: words}{8 \: minutes} = 50 \: words \: per \: minute[/tex]
2. Janssen's Time in Seconds:
[tex]3 \: minutes \: \times 60 \: seconds \: = 180 \: second s[/tex]
Ratio of Janssen's Time to Joana's Time:
[tex] \frac{180}{70} = \frac{18}{7} [/tex]
or 18:7
3.
[tex]80kph \: + 60kph \: = 140kph[/tex]
[tex]3hours \: + 2 \: hours = 5 \: hrs[/tex]
[tex] \frac{140kph}{5hrs} = 28kph[/tex]
The average speed is 28kph for the whole trip.