A car travels at 100 km at an average speed of 120
kmph and again travels 120 km at an average speed of 100
kmph. What would be average speed (approximately) of the
car for whole journey?
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1
1st case : time=distance/speed
=100/120
=5/6hr
2nd case:time=d/s
=120/100
= 6/5hr
average speed= total distance/ total time
=(100+120)÷5/6+6/5
=220÷(25+36)/30
=(220×30)/61
=108.196
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