Question

a man completed a trip of 136 km in 8 hours.some parts of the trip was covered at 15km/hr and the remainingat 18km/hr. find the part of the trip covered at 18km/hr.

Answer 1

The part of trip covered by 18km/hr =6Hour
Because 18*6=106
Left =30km
15*2=30

Answer 2

Let the part covered at 15 km/hr be x km

Then the part covered at 18 km/hr will be (136 – x) km

Now we know that time= distance / speed

(Check this attachment)

Hence the part covered at 15 km/hr is 40 km

and the part covered at 18 km/hr is (136 – 40) = 96 km