| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | KOR | Korea U20 |
KOR
|
39.71 Q NU20R | 0.140 |
| 2 | FRA | France U20 |
FRA
|
39.73 q SB | 0.170 |
| 3 | AUS | Australia U20 |
AUS
|
39.80 q | 0.155 |
| 4 | ESP | Spain U20 |
ESP
|
40.21 | 0.172 |
| 5 | GRN | Grenada U20 |
GRN
|
40.63 NU20R | 0.186 |
| SUI | Switzerland U20 |
SUI
|
DNF | 0.149 | |
| RSA | South Africa U20 |
RSA
|
DQ | 0.193 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | HKG | Hong Kong, China U20 |
HKG
|
39.97 Q | 0.154 |
| 2 | SRI | Sri Lanka U20 |
SRI
|
40.14 | 0.160 |
| 3 | CHN | PR of China U20 |
CHN
|
40.18 | 0.211 |
| 4 | ZIM | Zimbabwe U20 |
ZIM
|
40.40 NU20R | 0.176 |
| 5 | FIN | Finland U20 |
FIN
|
40.46 SB | 0.166 |
| 6 | PER | Peru U20 |
PER
|
41.80 SB | 0.215 |
| BRA | Brazil U20 |
BRA
|
DNF | 0.155 | |
| USA | United States U20 |
USA
|
DNF | 0.146 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | THA | Thailand U20 |
THA
|
39.56 Q NU20R | 0.180 |
| 2 | GBR | Great Britain & NI U20 |
GBR
|
39.75 q SB | 0.146 |
| 3 | GER | Germany U20 |
GER
|
40.06 | 0.178 |
| 4 | CZE | Czechia U20 |
CZE
|
40.41 | 0.182 |
| 5 | CAN | Canada U20 |
CAN
|
40.70 SB | 0.154 |
| 6 | CHI | Chile U20 |
CHI
|
41.62 | 0.176 |
| 7 | BUL | Bulgaria U20 |
BUL
|
41.92 SB | 0.183 |
| JPN | Japan U20 |
JPN
|
DQ | 0.152 |
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time |
|---|---|---|---|---|---|
| 1 | JAM | Jamaica U20 |
JAM
|
39.54 Q SB | 0.192 |
| 2 | TTO | Trinidad and Tobago U20 |
TTO
|
39.77 q SB | 0.204 |
| 3 | NGR | Nigeria U20 |
NGR
|
40.28 SB | 0.162 |
| 4 | DEN | Denmark U20 |
DEN
|
40.31 SB | 0.148 |
| 5 | MEX | Mexico U20 |
MEX
|
40.34 NU20R | 0.164 |
| 6 | ITA | Italy U20 |
ITA
|
40.44 SB | 0.146 |
| 7 | POL | Poland U20 |
POL
|
40.99 | 0.185 |
| ECU | Ecuador U20 |
ECU
|
DNS |