Relative speed = 68-8 = 60 km/hr = 60 X 5 / 18 m/s = 50/3 m/s
Total distance = 150 m
Time taken to pass a man running in same direction = 150 X 3/50 = 9 seconds
C.P. of 56 kg rice = Rs. (26 x 20 + 30 x 36) = Rs. (520 + 1080) = Rs. 1600.
S.P. of 56 kg rice = Rs. (56 x 30) = Rs. 1680.
Gain =(80/1600*100) % = 5%
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