A car travels a certain distance with a speed of 40 m/s and returns with a speed u. If the average speed for the whole journey is 48 m/s, what is the value of u? Ans= 60 m/s.
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average=(x+40)÷2=48
48×2=96
96 - 40=56 (ans)
48×2=96
96 - 40=56 (ans)
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