Question

A can a run a kilometer race in 3 1/2 minutes while b can run in 5 min same race how many mitre start can a give b in a km race

Answer 1

Answer:

300 meter

Step-by-step explanation:

Speed of A= 1000/210= 100/21 m/sec

Speed of B= 1000/300=10/3 m/Sec

To give start to B, Both has to complete race at same time.

Suppose A can give start by X meter.

1000/ Speed of A= (1000-X)/ Speed of B

1000/(100/21)= 1000/ Speed of B- X/ Speed of B

               210=  300-X/(10/3)

            X/(10/3)= 90

                     X=90*10/3=300 meter