A person starst form a point O and travels along a path PQRP as shown in the figure. Then, the speed of the operson is __________ m s^(-2)

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A person starst form a point O and travels along a path PQRP as shown in the figure. Then, the speed of the operson is __________ m s^(-2)

A. 0.2
B. 20
C. 12
D. 0.4

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From the given figure, by Pythagorous theorm PR^(2)=PQ^(2)+RQ^(2)
PR^(2)=4^(2)+3^(2)
PR^(2)=16+9
PR=sqrt(25)rArrPR=5m
Average speed
=("total distance")/("total time")=(4m+3m+5m)/(20s+10s+30s)
=(12m)/*(60s)=0.2 m s^(-1)