a motorist travelled 1/2 of his journey at 60 km/hr and completed the remainig 90 km in 3/2 hr . what was his average speed for the whole journey ?
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Answer:
60km/h
Step-by-step explanation:
(he has completed half 1/2 of his journey and remaing distance was 90km; that means total distance will be twice of the remaining)
total distance=90×2=180km
he travelled half at 60km/h
then he completed other half in 3/2hr means 1.5hours
that means his speed in completing the other half was=90/1.5
=60km/h
that means his average speed was also 60km/h
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