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2015-09-11T02:13:44+05:30

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Distance travelled in the first 10 seconds, =  avg velocity * time
     s1 = (50+60)/2 km/s * 10 sec  = 550 km

distance travelled inthe next 20 sec =  60 km/s * 20 s = 1, 200 km

so total distance in 30 sec. = 1, 750 km

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