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Grade 5 - Mathematics
12.1 Rates and Speed

Distance = Rate x Time
This formula can be written in different ways: To find rate, divide through on both sides by time:

Rate = Distance / Time
Rate is distance (given in units such as miles, feet, kilometers, meters, etc.) divided by time (hours, minutes, seconds, etc.).
Rate can always be written as a fraction that has distance units in the numerator and time units in the denominator, e.g., 25 miles/1 hour.

Time = Distance / Rate
When using this equation, it's important to keep the units same.
For instance, if the rate the problem gives is in miles per hour (mph), then the time needs to be in hours, and the distance in miles.
If the time is given in minutes, then divide by 60 to convert it to hours before you can use the equation to find the distance in miles.

Speed is defined as rate of change of distance. Speed is found using the formula: Speed = Distance / Time

  1. Speed is defined as rate of change of distance.
  2. Speed is found using S = D/T (S = Speed, D = Distance, T = Time)
Examples:
  • A factory worker is paid $96 for working 8 hours. What is his rate?
    For 1 hour, he is paid $96/8 = $12.
    Answer: He is paid the rate of $12 per hour.
  • If a car travels 55 mph for 5 hour. Find the distance the car travelled.
    Speed = D/T
    D = S x T
    D = 55 x 5
    Answer: 275 m


Directions: Solve the following. Also write at least 10 examples of your own.
Q 1: 1,600 ft.in 8 s. Find the rate.
345 ft per s
223 ft per s
200 ft per s

Q 2: A train travels 195 miles in 3 hours. Find the distance traveled in 1 hour.
63 mi/h
64 mi/h
65 mi/h

Q 3: What is a rate
is ratio between two equal quantities
is the ratio between two different quantities

Q 4: If a car travels 35 mph for 7hour. Find the distance the car traveled.
206
542
245

Q 5: If a car travels 1,125 mi at 125 mph. Find the time.
7 hours
9 hours
8 hours

Q 6: Joseph ran his scooter 35 mph for 2 hours. How far did he travel?
70 miles
60 miles
50 miles

Q 7: An aeroplane travels 550 mi/h for 4 hours. How far did it travel. (hint D = r x t)
2000 miles
550 miles
2200 miles

Q 8: Distance =
rate x time
rate x rate
rate + time

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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