Page 171 - NUMINO Challenge_B1
P. 171
Answer
Key
Creative Thinking p.134~p.135 3 Since clock (8:20) runs 1 hour faster than
1 Length of Night-time clock (7:20), the two clocks and must be
the Tokyo and Beijing clocks, respectively. Since
Length of Daytime clock (3:15) runs 5 hours and 5 minutes slower
than the Tokyo clock, clock must be the Cairo
1h 24min. clock. Since clock (2:40) runs 35 minutes
slower than the Cairo clock, clock must be
The sum of the colored parts is the Napoli clock.
24 h 1 h 24 min 22 h 36 min,
so the length of night-time is : Napoli, : Cairo, : Tokyo,
22 h 36 min 2 11 h 18 min, Beijing
and the length of daytime is
11 h 18 min 1 h 24 min 12 h 42 min. 4 There is a difference of 20 hours between 4 pm
The time of sunrise is (Time of sunset) (length
of daytime). on Monday and 12 pm the following day. When
So it is at 18:48 12 h 42 min 6:06 am. Robbie looked at his broken watch at 12 pm,
the watch showed 2:40 pm. So the clock ran 2
2 The watch is 6 minutes slower over 6 hours, so it hours 40 minutes faster in 20 hours. Since the
clock ran 120 40 160 minutes faster in 20
runs 1 minute slower per hour. Therefore it runs hours, it ran 160 20 8 minutes faster per hour.
24 minutes slower per day. The alarm clock runs
2 minutes fast per hour, so it runs 2 24= 48
minutes faster per day. The difference in time
increases by 48 24 72 minutes per day. There
is a difference of 12 hours (720 minutes) before
they tell the same time. The clocks will tell the
same time 720 72 10 days later.
NUMINO Challenge B1
Key
Creative Thinking p.134~p.135 3 Since clock (8:20) runs 1 hour faster than
1 Length of Night-time clock (7:20), the two clocks and must be
the Tokyo and Beijing clocks, respectively. Since
Length of Daytime clock (3:15) runs 5 hours and 5 minutes slower
than the Tokyo clock, clock must be the Cairo
1h 24min. clock. Since clock (2:40) runs 35 minutes
slower than the Cairo clock, clock must be
The sum of the colored parts is the Napoli clock.
24 h 1 h 24 min 22 h 36 min,
so the length of night-time is : Napoli, : Cairo, : Tokyo,
22 h 36 min 2 11 h 18 min, Beijing
and the length of daytime is
11 h 18 min 1 h 24 min 12 h 42 min. 4 There is a difference of 20 hours between 4 pm
The time of sunrise is (Time of sunset) (length
of daytime). on Monday and 12 pm the following day. When
So it is at 18:48 12 h 42 min 6:06 am. Robbie looked at his broken watch at 12 pm,
the watch showed 2:40 pm. So the clock ran 2
2 The watch is 6 minutes slower over 6 hours, so it hours 40 minutes faster in 20 hours. Since the
clock ran 120 40 160 minutes faster in 20
runs 1 minute slower per hour. Therefore it runs hours, it ran 160 20 8 minutes faster per hour.
24 minutes slower per day. The alarm clock runs
2 minutes fast per hour, so it runs 2 24= 48
minutes faster per day. The difference in time
increases by 48 24 72 minutes per day. There
is a difference of 12 hours (720 minutes) before
they tell the same time. The clocks will tell the
same time 720 72 10 days later.
NUMINO Challenge B1
