Asked by swift
On a 60 km straight road,a bus travels the first 30km with a uniform speed of 30kmh .How fast must the bus travel the next 30 km so as to have average speed of 40 kmh for entire trip.
Answers
Answered by
MathMate
First 30km with a speed of 30km/h means it took 1 hour.
For an average of 40km/h over 60 km, total time = 60/40 = 1.5 hours.
Time left for 30 km = 1.5-1 = 0.5 h.
Can you calculate the speed needed for the second half of the journey?
For an average of 40km/h over 60 km, total time = 60/40 = 1.5 hours.
Time left for 30 km = 1.5-1 = 0.5 h.
Can you calculate the speed needed for the second half of the journey?
Answered by
Anonymous
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Answered by
XYZZ
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Answered by
Sajal
Total Time taken t= distance / average speed=60/40=1.5h
Time taken to cover first half T1=30/30=1h
Time taken to cover second half T2=30/V
Now,T=T1+T2=1.5=1+30/V
Then,1.5V=1V+30
30=1.5V-1V
30=0.5V
30/0.5=V
Hence,V=60kmh
Time taken to cover first half T1=30/30=1h
Time taken to cover second half T2=30/V
Now,T=T1+T2=1.5=1+30/V
Then,1.5V=1V+30
30=1.5V-1V
30=0.5V
30/0.5=V
Hence,V=60kmh
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