The additional yard he will be able to run to after improving his speed is 40 x 40/100 = <<40*40/100=16>>16 yards.
So the total yard he will be able to run to after improving his speed is 40 + 16 = <<40+16=56>>56 yards in 5 seconds.
Therefore the total yards he will be able to run to within 10 seconds is 56 x 2 = <<56*2=112>>112.
#### 112