Rishi covers a distance first 30 minutes with 40kmph next 45 minutes with 60 kmph and 2 hrs with 70 kmph . Find the average speed.
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average speed = total distance/total time
we know,
distance = speed × time
Rishi covers total distance = distance covers in 30min with 40km/h + distance covers in next 45 min with speed 60 km/h + next 2 hours with speed 70 km/h
total distance = {30/60 hr}{40} +{45/60hr}{60} +{ 2hrs}{70}
= 20 km + 45 km + 140 km
= 205 km
total time taken by Rishi = 30min + 45min + 2 hrs = (1/2 + 3/4 + 2) hrs = 13/4 hrs
now,
Rishi's average speed = ( 205)/(13/4)
= 205×4/13 = 15.77×4 =63.08 km/h
we know,
distance = speed × time
Rishi covers total distance = distance covers in 30min with 40km/h + distance covers in next 45 min with speed 60 km/h + next 2 hours with speed 70 km/h
total distance = {30/60 hr}{40} +{45/60hr}{60} +{ 2hrs}{70}
= 20 km + 45 km + 140 km
= 205 km
total time taken by Rishi = 30min + 45min + 2 hrs = (1/2 + 3/4 + 2) hrs = 13/4 hrs
now,
Rishi's average speed = ( 205)/(13/4)
= 205×4/13 = 15.77×4 =63.08 km/h
abhi178:
ohhh sorry last term worng .
i edit it
now this is correct
but not accirate answer is 63.333 but here i answered 63.08 , how ??? i don't know . i am right conceptually
I'm waiting for another answer
see dm
okay
great answer abhi
:)
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2
here is the solution....!!!!
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ok, i did wrong . I'm sry
no need to say sorry...... anyways I have accepted ur apology...
:-)
thnx abhi
dear !!! give respect he is teacher
oh my god........ I am soo sorry respected sir.......
good ,
:)
I promise you sir I will never attempt such a mischievous act again
thank you sir.....
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