Dolphins can swim 49 kilometers per hour, 40% faster than blue whales. How many kilometers can blue whales swim per hour?
海豚每小时可以游49千米，比蓝鲸的速度快40%，蓝鲸每小时可以游多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">49 / (7/5)</gadget>
<output>35</output>

<result>35</result>