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Distance =3km = 3000m = 3× 10^5cm
Time = 5min = 300 sec =1/12 hrs
Speed = Distance/time
1) Speed= 3×10^5 cm/300sec
= 1000 cm/sec
2) Speed= 3000m/ 300sec
= 10m/sec
3) Speed = 3km/(1/12hrs) = 36km/hrs