Question
A man drives his car for 24 km at a speed of 48 km/h,
and for the next 1.5 hours he drives at a speed of 80 km/h. Find his average speed (in km/h) for the entire journey.Solution
Time taken for 24 km = 24/48 = 0.5 hours Distance covered in 1.5 hours = 80 x 1.5 = 120 km Average Speed = 120 + 24/ (1.5 + 0.5) =144/2 = 72 km/hr The correct answer is 72 km/hr.
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