When digging a canal, 1.9 kilometers were dug on the first day, and 0.15 kilometers less was dug on the second day than on the first day, leaving 1.05 kilometers to be dug. How long is this canal in kilometers?
挖一条水渠，第一天挖了1.9千米，第二天比第一天少挖0.15千米，还剩下1.05千米没有挖．这条水渠全长多少千米．
<gadget id="calculator">1.9 - 0.15</gadget>
<output>1.75</output>

<gadget id="calculator">1.9 + 1.75 + 1.05</gadget>
<output>4.7</output>

<result>4.7</result>