Unit of length is equal to

In one round of a stadium track Arun runs 200 m.In two rounds of stadium tracks Arun runs ___________ metres.

7km 9m -  _________ = 2km 3m 

If Amal's height in 2009 is 142cm. In 2011 it is 153. Then the difference in height is 

1500cm + 2500cm = ________ m 

25km 9m - 12km 2m = 

Add:2km 5m to 7km 4m 

8km   12m + 3km  5m = 

In one round of stadium Bibin runs 800m. In two rounds of stadium Bibin runs __________ m? 

100cm = __________ m