A car drives from A to B with a uniform speed of 40 kmh¹ and return back with a speed of 60 kmh¹ . Find its average speed.
Full explanation plz
Class 9 Maths
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Answer:
Speed = Distance/Time
→ 40 = x/Time
→ 40 × Time = x
→ Time = (x/40) h
___________
→ 60 = x/Time
→ Time × 60 = x
→ Time = (x/60) h
Average speed = 2x/[(x + 40) + (x/60)]
→ Average speed = 2x/[3x + 2x/120]
→ Average speed = 2x/(5x/120)
→ Average speed = 2x * (120/5x)
→ Average speed = 2 × 24
→ Average speed = 48 km/h (Answer)✔
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