Mr Wang was travelling from Town A to Town B.<br>After driving for $$\frac{2}{5}$$ of the journey at a speed of 100 $$km/h$$, he reduced his speed to 75 $$km/h$$ for the rest of the journey.<br>Town A was 150 $$km$$ from Town B.<hr>For what distance did he travel at a speed of 100 $$km/h$$? <br> <input min="0" type="number" id ="imp6pg168q8a_1" class="lineinput" placeholder="?" /> $$km$$