P.T. Usha and Dutee Chand take part in a 100 metre race. P.T. Usha runs at a speed of 5 m/s. P.T. Usha gives Dutee Chand a start of 4 metre and still beats him by 4 seconds. Find the speed of Dutee Chand.

P.T. Usha and Dutee Chand take part in a 100 metre race. P.T. Usha run

1.	P.T. Usha and Dutee Chand take part in a 100 metre race. P.T. Usha runs at a speed of 5 m/s. P.T. Usha gives Dutee Chand a start of 4 metre and still beats him by 4 seconds. Find the speed of Dutee Chand.
A.	4 m/s
B.	5 m/s
C.	6 m/s
D.	5.5 m/s
E.	4.5 m/s
Answer» B. 5 m/s