A runner covers east in and then west in

PHYSICS · Single correct · CBSE · Physics · Motion · Motion

Problem

A runner covers 120 m120\,\text{m} east in 15 s15\,\text{s} and then 80 m80\,\text{m} west in 20 s20\,\text{s}. What is the runner’s average speed for the whole motion? (a) 4.0 m/s4.0\,\text{m/s} (b) 6.0 m/s6.0\,\text{m/s} (c) 5.7 m/s5.7\,\text{m/s} (d) 3.4 m/s3.4\,\text{m/s}

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