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A car travel 100km at a …

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A car travel 100km at a speed 60km/h and returns with a speed of 40km/.Calculate the Average speed of the whole journey
  • 2 answers

Kabir Arora 5 years, 6 months ago

48km/hr

Gaurav Seth 5 years, 6 months ago

Distance one side = 100 km

Speed one side = 60 km/h

time taken one side = Distance/speed = 100/60 hr

= (100/60)*60 = 100 mins

Speed return = 40 km/h

time taken one side = Distance/speed = 100/40 hr

= (100/40)*60 = 150 mins

Total time take = 100 + 150 = 250 min

= 250/60 hr

= 25/6 hr

Total distance = 100 + 100 = 200 km

Average speed = 200/(25/6) = 48 km/hr

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