Question

a journey of 540 km is completed in 7 hour 30 minute if two third of Jounery is completed at 80 km per hour what speed is the remaining Jounery
completed

Answer 1

As 540 Kms of journey completes in 7 1/2 h = 15/2h

2/3 of journey = 540 x 2/3 = 360 Kms
Speed given = 80 km/h
Distance / speed = time
Time = 360 / 80 = 4 h 30 min = 4 1/2 h = 9/2h

Remaining distance = 540 - 360 = 180 Kms
Time taken for remaining distance that is 1 / 3 = 180 Kms
15 / 2 - 9/2 = 6 / 2
= 3 hours
Therefore the speed for the remaining journey is By speed = distance /time
Speed = 180 / 3 = 60
Therefore, the speed would be 60 Km /h