A car completes a journey of 270 km in 3 hrs 45 min. The first one-third of the journey was completed at 60 km/hr. Calculate the speed for the rest of the journey.
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total distance =270km
total time=3hr 45min or 225min
1/3 distance=90km
speed while this(90km)=60km/hr
let time taken while this='x' hr
according to formula
60=90/x
x=1.5hr or 1hr 30 min or 90min
rest journey=270-90=180km
rest time=225-90=135min 2.25hr
speed=180/2.25=80km/h
total time=3hr 45min or 225min
1/3 distance=90km
speed while this(90km)=60km/hr
let time taken while this='x' hr
according to formula
60=90/x
x=1.5hr or 1hr 30 min or 90min
rest journey=270-90=180km
rest time=225-90=135min 2.25hr
speed=180/2.25=80km/h
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