a person in car driving along a straight road from point A to point B at a speed of 60 km/hour for 15 mints and then from point B to point C at a speed of 90 km/hour for 10 mits. the average speed of his travel from point A to point C is
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Answer:
72 km/hr
Step-by-step explanation:
From A to B,
speed=60 km/hr
time = 15 min= 1/4 hour
distance= 60×1/4km
=15km
From B to C,
speed= 90 km/hr
time=10min=1/6 hour
distance= 90×1/6km
=15km
From A to C ,
total distance= 15+15km
=30km
total time= 15+10 min= 25 min= 5/12 hour
average distance= total distance/ total time
= 30/5/12km/hr
=72 km/hr
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