DATE
PACEN
an
A Bus caver
Bob KM in b hours calculate
How far does
in 30 minutes ?
ito speed
the bus go in 30 minutes
Answers
Step-by-step explanation:
The formula we want to use is s=v⋅t . Where
s is distance
v is velocity
t is time
This will show up so many times for you that I really recommend you to memorize it. Write your known parameters as variables in s,v and t .
s1=120 km
v1= unknown
t1=3 h
s2=150 km
v2=v1 (same speed for both trips)
t2= wanted
For both trips you have
st=v .
Since v is the same for both trips then
s1t1=s2t2 .
Solve for t2
t2=t1s2s1.
Doesn’t this seem very intuitive? If you double the distance the time needed doubles as well? Connect it with a trip you’ve recently made. If you needed to go 20 % further the time should increase by 20 % as well right? Also note that we didn’t need to find the velocity at all! Neat right?
To the answer!
Use the formula we found for t2
t2=3 h150120=3.75 h