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20 km per hour.
1 km per second is defined as equal to 1000 meters per second. Therefore, a speed of 15 meters per second is 15/1000 km per second or 0.015 km per second.
1.2 × 102 km/sec.
Your average speed was 12.4 miles per hour or 19.96 km per hour.
There's no proper reason. It was defined as such. Taking 1 as the denominator we can compare between two things easily like:Two trains are moving with following parametersFirst moving 500 km in 7 hrSecond moving 450 km in 6 hrWe have to determine who is faster... Now at unit (means one) hourFirst train is moving (500/7)=71.42 km per hourSecond train is moving (450/6)=75 km per hourSo clearly we can say that the 2nd train is faster.