Question 884860
Let's first convert it to meters for ease of use.  We'll convert it back later.
42km375m = 42,875 meters
6 trips * 42,875 = 257,250 meters
BUT, it's round trip, so twice that per day.
257,250 * 2 = 514,500 meters per day.
May has 31 days (ask your mom to show you the knuckle calendar trick)
31 * 514,500 = 15,949,500 meters
Now we'll convert back to km by moving the decimal three places.
15,949,500 meters = 15949.5km or 15,949km500meters
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(make sure to check my multiplication now that you have the process.)