| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Japan Junior |  JPN | 39.59 Q SB | 0.144 | 
| 2 | Jamaica Junior |  JAM | 39.90 Q | 0.152 | 
| 3 | Botswana Junior |  BOT | 40.01 q NJR | 0.175 | 
| 4 | Finland Junior |  FIN | 40.58 NJR | 0.126 | 
| Australia Junior |  AUS | DQ | 0.148 | |
| Greece Junior |  GRE | DNF | 0.166 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | United States Junior |  USA | 38.96 Q WJL | 0.156 | 
| 2 | Poland Junior |  POL | 39.95 Q | 0.176 | 
| 3 | Germany Junior |  GER | 40.04 q SB | 0.151 | 
| 4 | Nigeria Junior |  NGR | 40.36 SB | 0.154 | 
| 5 | Bahamas Junior |  BAH | 40.44 PB | 0.171 | 
| 6 | India Junior |  IND | 41.34 | 0.199 | 
| Sweden Junior |  SWE | DNF | 0.155 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Great Britain & N.I. Junior |  GBR | 39.72 Q SB | 0.255 | 
| 2 | Cyprus Junior |  CYP | 40.44 Q NJR | 0.149 | 
| 3 | New Zealand Junior |  NZL | 40.64 | 0.142 | 
| 4 | Oman Junior |  OMA | 41.57 | 0.173 | 
| France Junior |  FRA | DNF | 0.143 | |
| Switzerland Junior |  SUI | DNF | 0.170 |