A car travels certain distance with a speed of 90 km per hour and returns with a speed of 40 km per hour calculate average speed of whole journey.????
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let the one way distance be x km
total distance= 2x km
total time= x/90 + x/40
=13x/360
hence average speed will be
=2x/ 13x/360
=2×360/13
=720/13 km/hr
total distance= 2x km
total time= x/90 + x/40
=13x/360
hence average speed will be
=2x/ 13x/360
=2×360/13
=720/13 km/hr
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