Explanation:
x = speed of hiker1
because they meet, between the 2 of them, together they cover 15 miles in 2 hours.
2×x + 2×(x + 2.7) = 15
2x + 2x + 5.4 = 15
4x = 9.6
x = 2.4 mph
so one hiker was going 2.4 mph,
the other 2.4 + 2.7 = 5.1 mph.
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