well verified answers
1. Mental Arithmetic
Q1. A flight travels 360 km in 45 minutes. What is its average speed?
A. 360 km/h
B. 420 km/h
C. 480 km/h
D. 540 km/h
Answer: C — 480 km/h
Explanation:
45 minutes = 0.75 hours.
360 ÷ 0.75 = 480 km/h.
2. Percentages
Q2. What is 25% of 640?
A. 120
B. 140
C. 160
, D. 180
Answer: C — 160
Explanation:
25% = 1/4.
640 ÷ 4 = 160.
3. Speed, Distance and Time
Q3. An aircraft maintains 450 km/h. Approximately how far does it travel in 20 minutes?
A. 100 km
B. 120 km
C. 150 km
D. 180 km
Answer: C — 150 km
Explanation:
20 minutes = 1/3 hour.
450 × 1/3 = 150 km.
4. Physics — Force