Dana bikes 10 mi in 50 min. At this rate, how far can she bike in 90 min?
2 answers:
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Answer:
Marta's house is 3.10 miles from Latanya's house
Step-by-step explanation:
* Lets explain how to solve the problem
- Latanya leaves her house at 12:30 p.M.
- She bikes at 12 mi/hr to Marta's house
- She stays at Marta's house for 90 minute
- Both girls walk back to latanya's house at 2.5 mi/h
- They arrive at latanya's house at 3:30 p.M.
- We need to know how far is Marta's house from latanya's house
∵ Latanya starts her trip at 12:30 p.M.
∵ She returns her home at 3:30 p.M.
∴ The time of her trip is → 3:30 - 12:30 = 3 hours
- But she stays at at Marta's house for 90 minutes
∵ 1 hour = 60 minutes
∴ 90 minutes = 90 ÷ 60 = 1.5 hours
∴ The time from her house to Marta's house and from Marta's house
to her house is → 3 - 1.5 = 1.5 hours
- Assume that the distance from her house to Marta's house is d
and the time from her house to Marta's house is ,
the time from Marta's house to her house is
∵ Latanya bikes at 12 mi/h to Marta's house
∵ Distance = speed × time
∴ d = 12 ×
∵ Both girls walk back to latanya's house at 2.5 mi/h
∴ d = 2.5 ×
- Equate the two expressions of d
∴ 12 = 2.5
⇒ (1)
∵ +
= 1.5
- Subtract from both sides
∴ = 1.5 -
⇒ (2)
- Substitute equation (2) in equation (1)
∴ 12 = 2.5(1.5 -
)
∴ 12 = 3.75 - 2.5
- Add 2.5 to both sides
∴ 14.5 = 3.75
- Divide both sides by 14.5
∴ =
hour
∴ She spends 15/58 hour to bike to Marta's house
- Lets find d
∵ d = 12
∴ d = miles
* <em>Marta's house is 3.10 miles from Latanya's house</em>