a car travels 120km/h with a speed of 40km/h and returns with a speed of 30km/h ...find the average speed..
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d=120 km
s1= 40km/h
s2=30 km/h
t1=d/s1
= 120/40
= 3 hrs
t2= d/s2
= 120/30
= 4 hrs
avg. s = 2d/(t1+t2)
= 240/7
=34.28 km/h
s1= 40km/h
s2=30 km/h
t1=d/s1
= 120/40
= 3 hrs
t2= d/s2
= 120/30
= 4 hrs
avg. s = 2d/(t1+t2)
= 240/7
=34.28 km/h
MissX111:
thanku sooo much....
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