Question 1094426
distance/time = rate
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1400/(240 + x) = 1400/276 <---hours to minutes
(x+240)/1400 = 69/350
x + 240 = 69/350 * 1400/1
x + 240 = 276
x = 36
36/2 = 18
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1400/240+18 = 5.43;  1400/276-18 = 5.43 Correct