A man completes 30km of journey at 6km/hr and remaining 40km of journey in 5 hrs.His average speed for whole journey is
a. 6 4/11 km/hr
b.7 km/hr
c.7 1/2km/hr
d.8 km/hr

• 30 KM of journey at 6km/hr so time=Distence/speed
  time=30/6=5hr
  and remaininr distence he cover in 5 hr so totla hr=10
  and total distence=70
  so speed=total distance/total time
  speed=70/10=7
  so ans is 7
• 9 years agoHelpfull: Yes(1) No(1)
• 30km->6km/hr-- totally 5hrs journey
  40km->5hrs i.e., 8km/hr
  Average speed of whole journey=(total distance)/(total time)
  i.e.,
  As=(td)/(ts)
  As=(30+40)km/(5+5)hr
  As=70km/10hr
  As=7km/hr
  Answer : 7km/hr .
• 4 years agoHelpfull: Yes(0) No(0)