Question 1 of 51

Mary started cycling from home to school at a speed of 300 m/min at 6 am. Her brother started cycling from home later. They were beside each other at 6:30 am and her brother reached school at 7 am. While Mary was still 1800m way. If both of them traveled at a constant speed throughout the journey, what time did her brother leave home?

A
5:05am
B
6:05am
C
7:05am
D
7:50am
E
None of the above