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A40/8 m/s

B500/9 m/s

C188/9 m/s

D270/8 m/s

Answer:

B. 500/9 m/s

Read Explanation:

aerage speed =(total distance )/(total time)

distance =12800-12000=800km

time = 4hrs

speed =800/4=200 kmph

speed in m/s =200*{5/18}=500/9 m/s


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