Video Transcript
Jennifer leaves to take her dog for
a walk at 7:05. They walk for 20 minutes. What time do they return?
This question describes Jennifer
who’s taking her dog for a walk. And we’re asked what time they both
get back from their walk, in other words, what time their walk ends. And to help us know what time their
walk ends, we’ve got two pieces of information to help us. Firstly, we know what time their
walk starts. The start time for their walk is
7:05 or five past seven. This is going to be important to
us, so let’s sketch it on a clock. Now, we know at 7 o’clock, the
minute hand would be pointing directly to the number 12 and the hour hand would be
pointing straight at the number seven.
Now, at 7:05, five minutes have
gone by. And because we know the gap between
one number and the next number on a clock face is worth five minutes, we know the
minute hand at five past seven is pointing to the number one. And because it’s still quite near
to 7 o’clock, the hour hand won’t have moved very much. This is what the clock looks like
when Jennifer and the dog leave.
The other piece of information that
we’re going to use here to help us is how long it takes them. We’re told that they walk for 20
minutes. What will happen to the hands of a
clock in 20 minutes? At five past 7, the minute hand is
pointing to the number one as we’ve said. Let’s count on another 20
minutes. And we’re going to skip count in
fives to help us do this. Five, 10, 15, 20.
We can see then that when Jennifer
returns home, the minute hand is going to be pointing to the number five. We know that when it points to a
six, it is a half past time. And at that point, the hour hand
will be halfway between the seven and the eight. So, at the moment, it’s almost half
past 7. So, we could draw the hour hand
about here. So, how would we read this
time? We know that it’s still 7
something, that if the minute hand was pointing to the number six, it would be
7:30. At the moment, it’s one number
before the six, isn’t it? So, this is five minutes before
30. We know that 30 take away five is
25. And so, the time that Jennifer and
her dog return home is 7:25.
