A man completed a trip of 136 km in 8 hours. Some parts of the trip was covered at 15km/h and the remaining at 18km/h. find the part of the trip covered at 18km/hr.
Answers
Answered by
1
Let x km = the part he covered in 15 km/hr
This means 136-x km = the part he covered in 18 km/hr
Since time = distance%2Frate
==> time traveled in 15 km/hr is x%2F15,
and time traveled in 18 km/hr is %28136-x%29%2F18
=> x%2F15+%2B+%28136-x%29%2F18+=+8
<=> %286x%29%2F90+%2B+%285%28136-x%29%29%2F90+=+8
=> %28x%2B680%29%2F90+=+8
<=> x%2B680+=+720
=> x = 40 km
=> 136-x = 96 km.
Therefore he covered 96 km traveling at the rate of 18 km/hr .
hope this answer help you
Similar questions