Step-by-step explanation:
Firstly to facilitate the conversion we need to convert mph to km/h.
50 m= 0.05 km
1 mph= 0.001 km/h
2 mph= 0.002 km/h
For the girl
D=0.05 km
S= 0.002 Km/h
T= 25 h
For the Boy
D=0.05
S= 0.001
T= 50 h
Now to find after how many time they will meet each other, we simply have to add the two times.
So,
25 h + 50 h= 75 h
ANS: 75 h