Rahul set off on a 270km journey at 09:00. He drove at a speed of 80 km/h for the first 1 1/2 hours. For the rest of the journey, he drove at a speed of 60 km/h. At what time did he complete the journey?

• 1:00
  Distance covered in first 1 1/2 or 3/2 hrs= 80*3/2=120 km
  Remaining distance=270-120=150 km
  Time to cover 150 km@60 km/h=150/60=5/2 hr
  Total time of journey=(3/2)+(5/2)=8/2=4 hr.
  So time to complete the journey= 09:00 hr + 4 hr= 13:00 or 01:00 hr
• 11 years agoHelpfull: Yes(0) No(0)
• distance covered by rahul in 1 1/2hour is 80+40=120
  remaining distance=270-120=150
  time taken to complete 150 km with 60km/h is=150/60
  = 15/6
  =2 1/2
  hence total time=2 1/2+ 1 1/2=3+1=4
  9+4=13
  13=12+1=01:00
• 11 years agoHelpfull: Yes(0) No(0)