the average speed for the entire Journey
Acar covers 30 km at a uniform speed of 30 km/hr. What should be its speed
for the next 90 km, if the average speed for the entire journey is 60km/hr
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Distance covered in 1st half = 30km
speed of 30km = 30 km/hr
time = distance / speed
t=30/30
=1 hour
average speed = total distance / total time
60=30+90/1+x
60(1+x)=110
60+60x=110
60x=110-60
60x=50
x=50/60
x=0.83.....
speed = distance / time
=90/0.83
=107.36km/hr
sunnyXavier:
wrong answer
30 plus 90 is 120 not 110
yes
oh how sorry wrong calculation but the method is correct
oh how sorry wrong calculation but the method is correct so you can do it in the same way
oh how sorry wrong calculation but the method is correct
and then the speed = 90/2 = 45km/hr
sorry just forget about the above message the answer is wrong it should be 90/1 = 90km/hr
tq sister
welcome
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