1.

DuLLICIOULOUILLOA car travels 100 km at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the averagespeed for the whole journey.

Answer»

Tofal distance covered = (100+ 100) km = 200 kmTotal time taken = (100/60 + 100/40) = ( 5/3 + 5/2) = 25/6 hours.Average speed = (Total Distance÷ Total Time )= (200 ÷ 25/6 )= (200/1 × 6/25) Km/hr= 48 Km/hr .

48 km/HR is right answer



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