Time and Temperature | Math Olympiad for Class 5 PDF Download

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Q1. A school bus leaves at 7:45 a.m. and takes 1 hour 25 minutes to reach school. What time does it arrive?
(a) 9:00 a.m.
(b) 9:10 a.m.
(c) 8:50 a.m.
(d) 8:55 a.m.
Ans: (b) 9:10 a.m.

Start time = 7:45 a.m. 
Add 1 hour = 8:45 a.m.
 Then add 25 minutes: 45 + 25 = 70 minutes = 1 hour 10 minutes. 
So, 8:45 a.m. + 1 hour 10 minutes = 9:10 a.m.

Q2. A movie starts at 3:15 p.m. and ends at 5:45 p.m. How long is the movie?
(a) 2 hours 15 minutes
(b) 2 hours 30 minutes
(c) 3 hours
(d) 1 hour 45 minutes
Ans: (b) 2 hours 30 minutes

From 3:15 p.m. to 5:15 p.m. is 2 hours. 
Then, 5:15 p.m. to 5:45 p.m. is 30 minutes. 
Total = 2 hours + 30 minutes = 2 hours 30 minutes.

Q3. A train departs at 16: 45 hours and arrives at 19: 20 hours. How long is the journey?
(a) 2 hours 35 minutes
(b) 3 hours 15 minutes
(c) 2 hours 45 minutes
(d) 2 hours 15 minutes
Ans: (a) 2 hours 35 minutes

16: 45 hours = 4:45 p.m., 
19: 20 hours = 7:20 p.m. 
From 4:45 p.m. to 6:45 p.m. = 2 hours. 
Then, 6:45 p.m. to 7:20 p.m. = 35 minutes. 
Total = 2 hours 35 minutes.

Q4. The temperature outside is 25° C. If it drops by 7° C at night, what is the new temperature?
(a) 32°C
(b) 18°C
(c) 20°C
(d) 17°C
Ans: (b) 18° C

Starting temperature = 25°C. Drop = 7°C. New temperature = 25 - 7 = 18°C.

Q5. A cake bakes for 45 minutes and cools for 15 minutes. How many seconds is the total time?
(a) 3,600 seconds
(b) 3,000 seconds
(c) 2,700 seconds
(d) 3,300 seconds
Ans: (a) 3,600 seconds

Total time = 45 + 15 = 60 minutes. 
1 minute = 60 seconds. 
So, 60 × 60 = 3,600 seconds.

Q6. The weather report says it’s 86°F today. What is this temperature in Celsius?
(a) 30°C
(b) 32°C
(c) 28°C
(d) 25°C
Ans: (a) 30°C

Conversion from Celsius to Fahrenheit.
 Subtract 32, then multiply by 5/9. 86 - 32 = 54. 54 × 5/9 = 30°C.

Q7. A school day starts at 8:00 a.m. and ends at 2:30 p.m. How many hours and minutes does it last?
(a) 6 hours 30 minutes
(b) 7 hours
(c) 6 hours
(d) 5 hours 30 minutes
Ans: (a) 6 hours 30 minutes

 From 8:00 a.m. to 2:00 p.m. = 6 hours. 
Then, 2:00 p.m. to 2:30 p.m. = 30 minutes. 
Total = 6 hours 30 minutes.

Q8. An ice cream needs to be kept at 0°C. If the freezer is at 5°C, how many degrees must it be cooled?
(a) 5°C
(b) 3°C
(c) 2°C
(d) 4°C
Ans: (a) 5°C

 Current temperature = 5°C. 
Target = 0°C. 
Difference = 5 - 0 = 5°C.

Q9. Ravi takes 150 seconds to finish his homework page. How many minutes and seconds is this?
(a) 2 minutes 30 seconds
(b) 2 minutes 50 seconds
(c) 3 minutes
(d) 1 minute 50 seconds
Ans: (a) 2 minutes 30 seconds

We Know that, Divide 150 by 60: 150 ÷ 60 = 2 minutes (120 seconds) + 30 seconds left. 
So, 150 seconds = 2 minutes 30 seconds.

Q10. Priya’s dance class lasts 1 hour 45 minutes. If it starts at 15:30 hours, when does it end?
(a) 17:15 hours
(b) 16:45 hours
(c) 17:00 hours
(d) 16:15 hours
Ans: (a) 17:15 hours

1530 hours = 3:30 p.m. 
Add 1 hour = 4:30 p.m. (16:30 hours).
 Add 45 minutes: 4:30 p.m. + 45 minutes = 5:15 p.m. = 17:15 hours.