During a running test in school, Nelson jogged quickly at a speed of 250 $$m/min$$ for 8minutes.<br>He became exhausted and walked for the remaining distance of 400 $$m$$.<br>He took 15 minutes to complete the test. <hr> What was his average speed for the test in $$m/min$$ <br> <input min="0" type="number" id ="imp6pg158q5b_1" class="lineinput" placeholder="?" /> $$m/min$$