A car travels first 450 kms of a journey at a speed of 90 kmpr and the remaining 750km at a speed of 50kmph fins the average
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formula ; distance = speed * time
case1 : Distance = 450 km ; speed = 90 kmph
time = distance/speed
t = 450/90
= 5 h
case2 : distance = 750 km ; speed = 50 kmph
time = 750/50
= 15 h
total distance = 450+750 = 1200 km
total time = 5+15 = 20 h
so average speed of total journey = total distance / total time
average speed = 1200/20 = 60 kmph
case1 : Distance = 450 km ; speed = 90 kmph
time = distance/speed
t = 450/90
= 5 h
case2 : distance = 750 km ; speed = 50 kmph
time = 750/50
= 15 h
total distance = 450+750 = 1200 km
total time = 5+15 = 20 h
so average speed of total journey = total distance / total time
average speed = 1200/20 = 60 kmph
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Time- 450/90= 5hr
another time- 750/50= 15hr
average speed= (450+750)/(5+15)=60km/hr
another time- 750/50= 15hr
average speed= (450+750)/(5+15)=60km/hr
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