The time taken to mow 7 lawns at the same rate it takes to mow 4 lawns is 8.75 hours
What is speed?
Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
With the above concept, we shall determine time to mow 7 lawns as follow:
How to determine the rate
- Time = 5 hours
- Lawn = 4 lawns
Rate = Lawn / time
Rate = 4 / 5
Rate = 0.8 lawn/hour
How to determine the time to mow 7 lawns
- Lawn = 7 lawns
- Rate = 0.8 lawn/hour
Rate = Lawn / time
0.8 = 7 / time
Cross multiply
0.8 × time = 7
Divide both side by 0.8
Time = 7 / 0.8
Time = 8.75 hours
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