Объяснение:
Ответ: 14,4 часа.
V(+) = x + y = S / t1
V(-) = x - y = S / t2
2y = 2S / t = S / t1 - S / t2
2 / t = 1 / t1 - 1 / t2 = 5/9 - 5/12 = 5/36
1 / t = 5/72 = 1/14,4
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Verified answer
Объяснение:
Ответ: 14,4 часа.
V(+) = x + y = S / t1
V(-) = x - y = S / t2
2y = 2S / t = S / t1 - S / t2
2 / t = 1 / t1 - 1 / t2 = 5/9 - 5/12 = 5/36
1 / t = 5/72 = 1/14,4