Answer clarification: another race problem.

A can run 1 km in 4 minutes 51 seconds and B in 5 minutes.

How many meters start can A give B in a Km race, so that the race may end in a dead heat?

My answer:

There is a difference of 9 seconds between A and B.

A runs 30.8 meters in 9 sec so A has to give B a start of 30.8 meters.

But the answer says 30 meters. Can any one get 30 meters. Appreciate your help.

Re: Answer clarification: another race problem.

Re: Answer clarification: another race problem.

Just wondering why my style of solving gives an extra .8 meters.