step by step ans plz?

Question

7.A boy goes to school from his house.on one fourth oh his way to school,
he crosses a machinery station. And on one third of his way to school, he crosses a Railway station. He crossed the machinery station at 7:30 and he crosses the Railway station at 7:35. When does he leave the house & when does he reach the school ?

Answer 1

Suppose total time for
journey is "a"

a/3-a/4= 5minutes

4a/12-3a/12=5 minutes

4a-3a = 5 x 12 = 60 minutes

Total journey = 60 minutes

a = 60 minutes

Suppose starting time "b"

b+ a/4 = b+15 = b'15" = 7'30"
b= 7'15"

Boy starts at 7:15
Covers 1/4th distance at 7:30
Covers 1/3rd distance at 7:35
Reaches school at 8:15