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  On Time Late
Charges per trip 50 45 = 90% x 50
Trips 14u = 20u – 6u 6u
Total charges 700u = 50 x 14u 270u = 45 x 6u
Note: "For every 20 trips made, 6 were late" means 14 were on time.
Total charges collected is 700u + 270u = 970u = 12610. So u = 13.
Number of trips made on time = 14u = 14 x 13 = 182.

Having solved this series of problems, we suggest the following:
- use a table to track all the information
  (the title says Draw a Model. but we feel that tables are
   more useful in these questions.)
- if ratios are given, use units to express them as concrete numbers
  (so if ratio is 5:4, then use 5u and 4u, etc).
  This allows us to multiply and add them.

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