a man cycles at 20km/hr over a certain distance and then returns over hr same distance at a speed of 15 km/hr. What is the average speed for the whole journey??
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Step-by-step explanation:
V1=20km/hr
V2=15km/hr
Distance is equal so
Average speed =2(v1.v2 /V1+V2)
=2(300/35)=17.1428km/hr=7 1/7km/hr
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