SOLUTION: When I walk from my house at 4km/h, I will get to the office 30 minutes later than when I walk at 5km/h. Calculate the distance between my house and office
Let d be that distance.
Then you have this "time equation" from the condition
- = of an hour.
To solve it, multiply both sides by 20. You will get
5d - 4d = 10
d = 10.
Answer. The distance between your house and office is 10 kilometers.
Answer by addingup(3677) (Show Source): You can put this solution on YOUR website! 30 minutes = 1/2 hour, or 0.5 hour
d = 5(t)
d = 4(t + 0.5)
.
5t = 4(t + 0.5)
5t = 4t + 2
t = 2
.
d = 5t = 5(2) = 10 km
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Check:
5(2) = 10
and
4(2+0.5) = 10 Correct