transport team transported a batch of tents to the earthquake-stricken area. It originally planned to travel 70 kilometers per hour and arrive in 12 hours. Due to the damage to the road, the actual travel was 40 kilometers per hour. How many hours did it actually take for the transport team to reach the disaster area?
某运输队将一批帐篷运往地震灾区，原计划每小时行70千米，12个小时到达，由于道路多处受损，实际每小时行40千米．运输队到达灾区实际用了多少小时？
<gadget id="calculator">12 / 40</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">70 * (3/10)</gadget>
<output>21</output>

<result>21</result>