a car moves a distance of 200m. it covers the first half of the distance at speed 40 km/h and second half of the distance at speed v. the average speed is 48km/h. the value of v is
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average speed =2xy/x+y
48=2×40×v/40+v
48=80v/40+v
48v +1920=80v
80v-48v=1920
32v=1920
v=1920/32
v=60kmph is answer
48=2×40×v/40+v
48=80v/40+v
48v +1920=80v
80v-48v=1920
32v=1920
v=1920/32
v=60kmph is answer
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