jm + jn + km + kn = j(m + n) + k(m + n) = (m + n)(j + k)
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Convert everything to the same unit, then do the addition. Remember that a kilometer is 1000 meters. Either like this: (Convert to meters) 3 km + 800 m... = 3000 m + 800 m... Or: (convert to km) 3 km + 800 m... = 3 km + 0.8 km...
7.4 km
Factor 1000!
1.26km or 1260m.
Line up the decimals4.62.17____6.77 km