Question 1101682
Part of the process:
From 8AM, less important than "whole journey took 11 and 1/4 hours", which included the 1/2 hour break.  Total TRAVEL TIME was {{{10&3/4}}} hours.


Part A, i and ii, and focusing on time quantities, not time points
<pre>
Let b be the distance traveled by bus.

              SPEED        TIME           DISTANCE
TRAIN          50          (700-b)/50      700-b
BUS            75           b/75            b
Total                      10.75           700
</pre>
Most of the work can now be done in one variable.

{{{highlight_green((700-b)/50+b/75=10&3/4)}}}
and you can solve the equation...