a car cover 30 km at a uniform speed of 30km/hr. what should be its speed for the next 90km/hr if the average speed for the entire journey is 60km/h?

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Solution

Total distance = 30+90=120
if avg. spd is 60 km/h then total time to cover the dist. is 2 hour.
avg spd.= (30+x)/2

distance=spd * time

120=(30+x)/2*2
120=30+x
x=120-30=90
i.e spd = 90 km/h

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a car cover 30 km at a uniform speed of 30km/hr. what should be its speed for the next 90km/hr if the average speed for the entire journey is 60km/h?

Total distance = 30+90=120 if avg. spd is 60 km/h then total time to cover the dist. is 2 hour. avg spd.= (30+x)/2 distance=spd * time 120=(30+x)/2*2 120=30+x x=120-30=90 i.e spd = 90 km/h

Total distance = 30+90=120
if avg. spd is 60 km/h then total time to cover the dist. is 2 hour.
avg spd.= (30+x)/2

distance=spd * time

120=(30+x)/2*2
120=30+x
x=120-30=90
i.e spd = 90 km/h