Q1 has already being completed i just need help with q2 and 3

My final answer for Q1 was

Chainage At C = 2603.870M

Chainage At B = 2345.765M​

Q1 has already being completed i just need help with q2 and 3My final answer for Q1 wasChainage At C 2603870MChainage At B 2345765M class=