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Secondary 1 | Maths
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Durga
Durga

Secondary 1 chevron_right Maths chevron_right Singapore

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Date Posted: 4 weeks ago
Views: 22
snell
Snell
4 weeks ago
1st, formula :
avg speed = dist/time

1st 350 km:
avg speed = v
d = 350km
t = t1 = 350/v

next 120 km:
avg speed = v-15
d = 120km
t = t2 = 120/(v-15)

since t1 = t2
350/v = 120/(v-15)
350v - 5250 = 120v
v = 22.83 km/h

avg speed for 2nd part of journey
is 7.83 km/h


*a bit much to expect a person to cycle for more than 30h

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AC Lim
Ac Lim's answer
1635 answers (A Helpful Person)
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Hope this help