3 years ago

Homework: 2.5 HW

Mathematics

1 answer:

____ [38]3 years ago

5 0

Step-by-step explanation:

x = downstream speed in mph

4 hours × (x-10) + 3 hours × x = 58 miles

4x - 40 + 3x = 58

7x = 98

x = 14 mph downstream speed

and as extra :

therefore his upstream speed was 14 - 10 = 4 mph

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