A car travelled 30km at a uniform speed of 40km/hr and the next 30km at a uniform speed of 20km/hr.Find its average speed
Answers
Answered by
1
We have to first find Time
Time =Distance /speed
= 60/60
=1hour
Average speed = Total Distance /Total Time
= 60/1
= 60km/h.
Answered by
0
Answer:
avg. speed of car is 80/3 km/hr.(26.66..)
Step-by-step explanation:
given: s1=30 km and v1= 40 km/hr....t1=?
s2=30 km and v2 =20 km/hr.....t2=?
∴t1 =s1/v1 and t2=s2/v2
i.e t1=3/4 sec and t2=3/2 sec
wkt.,avg.speed= total distance/total time taken...
<s>=(s1+s2)/(t1+t2) km/hr
<s>=30+30/(3/4+3/2) km/hr
on taking LCM....
we get..<s>=60*4/9 i.e <v>=80/3 km/hr
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