I came up with 104.5 knots using a web-based planning tool, and 105 using MDR:
Wind is 40 deg off, so about 3/4 to apply to the headwind, that's 15 knots, G/S is 105.
Which is 7/4 miles per minute and makes ETA estimates very simple.
The point which blagger and I have both made is that use of MDR for pre-flight planning is insufficiently accurate unless you also work out the planned G/S and corresponding fix point ETAs before flight. But it would be just as quick to use the whizz-wheel - particularly for time v distance estimates.
Using still-air IAS for low level high speed flying is one thing, ignoring W/V for pre-flight planning in a plastic puddlejumper at 3000 ft quite another. In the example I quoted, you would start your navigation exercise with an immediate 14% error which is wholly unacceptable. Try that on a PPL Skill Test and you will certainly fail.