A body travels first half of its journey with a speed of 40kmph and the next half with the speed of 60 kmph. Find the average speed of the body for the entire journey.
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ʜᴇʟʟᴏ ᴍᴀᴛᴇ!
Let total distance be d
Speed = distance / time
20 = d/2 / t1
t1 = d/40
30 = d/2 / t2
t2 = d / 60
Average speed = Total Distance / Total time
= ( d/2 + d/2 ) / ( t1 + t2 )
= d / ( d / 40 + d / 60 )
d / 5d × 120 = 24 km/h
Hope it helps
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