a car with half the distance of 40 km/h of your journey and half the distance of v km/h. find out the value the car if the average speed as 48 km/h.
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(b)
48= 200/((100/40)+(100/v) )
or 1/40+1/v= 2/48=1/24
or 1/v=1/24-1/40=2/120=1/60
or v=60km/h
[Alt: v_av = (2v_1 v_2)/(v_1+v_2 ) => 48= (2×40×v)/(40+v) => v=60 km/h]
48= 200/((100/40)+(100/v) )
or 1/40+1/v= 2/48=1/24
or 1/v=1/24-1/40=2/120=1/60
or v=60km/h
[Alt: v_av = (2v_1 v_2)/(v_1+v_2 ) => 48= (2×40×v)/(40+v) => v=60 km/h]
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