Pat works in the city and lives in the suburbs with Sal. Every afternoon, Pat gets on a train that arrives at the suburban station at exactly 5 P M . Sal leaves the house before 5 and drives at a constant speed so as to arrive at the train station at exactly 5 P M to pick up Pat. The route that Sal drives never changes. One day, this routine is interrupted, because there is a power failure at work. Pat gets to leave early, and catches a train which arrives at the suburban station at 4PM. Instead of phoning Sal to ask for an earlier pickup, Pat decides to get a little exercise, and begins walking home along the route that Sal drives, knowing that eventual ly Sal will intercept Pat, and then will make a V-tum, and they will head home together in the car. This is indeed what happens, and Pat ends up arriving at home 10 minutes earl ier than on a normal day. Assuming that Pat 's walking speed is constant, that the V-tum takes no time, and that Sal 's driving speed is constant, for how many minutes did Pat walk?
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
Pat works in the city and lives in the suburbs
with Sal. Every afternoon, Pat gets on a train that arrives
at the suburban station at exactly 5 P M . Sal leaves
the house before 5 and drives at a constant speed so as
to arrive at the train station at exactly 5 P M to pick up
Pat. The route that Sal drives never changes.
One day, this routine is interrupted, because there
is a power failure at work. Pat gets to leave early, and
catches a train which arrives at the suburban station
at 4PM. Instead of phoning Sal to ask for an earlier
pickup, Pat decides to get a little exercise, and begins
walking home along the route that Sal drives, knowing
that eventual ly Sal will intercept Pat, and then will
make a V-tum, and they will head home together in
the car. This is indeed what happens, and Pat ends up
arriving at home 10 minutes earl ier than on a normal
day. Assuming that Pat 's walking speed is constant,
that the V-tum takes no time, and that Sal 's driving
speed is constant, for how many minutes did Pat walk?
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