Page 147 - NUMINO Challenge_M1
P. 147
Answer
Key
2 Use the reflection to draw the original clock.
Mirror reflection Original clock
Type Study In the original clock, if the needle to the left is the hour hand, then the
other needle should be at 12. This shows that the left needle is the
minute hand and the needle pointing down is the hour hand.
The actual time shown on the clock is 5:45.
Clock A moves 10 minutes fast every hour, and shows 1:10 at 1:00. Clock B
moves 5 minutes slow every hour and shows 12:55 at 1:00.
So, they are 15 minutes apart.
AB
AB
They are 30 minutes apart.
The two clocks are 15 minutes apart after one hour, so they will be 15^4=
60 minutes apart after 4 hours.
10 NUMINO Challenge M1
Key
2 Use the reflection to draw the original clock.
Mirror reflection Original clock
Type Study In the original clock, if the needle to the left is the hour hand, then the
other needle should be at 12. This shows that the left needle is the
minute hand and the needle pointing down is the hour hand.
The actual time shown on the clock is 5:45.
Clock A moves 10 minutes fast every hour, and shows 1:10 at 1:00. Clock B
moves 5 minutes slow every hour and shows 12:55 at 1:00.
So, they are 15 minutes apart.
AB
AB
They are 30 minutes apart.
The two clocks are 15 minutes apart after one hour, so they will be 15^4=
60 minutes apart after 4 hours.
10 NUMINO Challenge M1
