5(5+x) = 6(6+4)
25+5x = 60
5x = 35
x = 7
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3(3+5) = 4(4+x)
24 = 16 + 4x
4x = 24-16
4x = 8
x = 2
The distance, s = 40t₁ where t₁ is the time to complete the outward journey.
The same distance = vt₂ where t₂ is the time to complete the return journey at speed v.
For the whole journey, 2s=60(t₁+t₂). Therefore s=30(t₁+t₂)=40t₁=vt₂.
30t₁+30t₂=40t₁, 10t₁=30t₂, t₁=3t₂, so s=120t₂=vt₂ and v=120kph.
Answer:
Step-by-step explanation:
Answer:
Step-by-step explanation:
Answer:62.92
Step-by-step explanation:
50/100f=.5f ... 31.46/.5=62.92 ... 62.92=f
