Speed Distance MCQs set 3 for ISSB - PAF Officer Selection Mathematics — 20 solved questions.
Q1. Boat 10 km/h in still water, upstream 2 km/h. Upstream speed?
Answer: 8 km/h
Explanation: Upstream speed is boat minus stream so 10 minus 2 equals 8.
Q2. A walks 4 km/h, B runs 8 km/h. B catches A who had 2 km head start in?
Answer: 0.5 h
Explanation: Relative speed 4 km/h closes 2 km gap in 0.5 hours. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q3. Cyclist 18 km/h for 2 h then 12 km/h for 1 h. Average speed?
Answer: 16 km/h
Explanation: Total 48 km in 3 hours gives average speed 16 km/h. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q4. Train 108 km/h for 25 minutes. Distance?
Answer: 45 km
Explanation: Twenty five minutes is 5/12 hour so 108 times 5/12 equals 45 km.
Q5. Man rows 6 km/h in still water, stream 2 km/h. Downstream speed?
Answer: 8 km/h
Explanation: Downstream speed is rowing plus stream so 8 km/h. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q6. Relative speed same direction 80 and 50 km/h?
Answer: 30 km/h
Explanation: Same direction subtract speeds so 80 minus 50 equals 30. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q7. A train 150 m long passes pole in 15 s. Speed?
Answer: 10 m/s
Explanation: Speed equals distance over time so 150 divided by 15 is 10 m/s.
Q8. Two cars 60 km apart approach at 40 and 20 km/h. Meet in?
Answer: 1 h
Explanation: Combined speed 60 km/h closes 60 km in 1 hour. Apply the same method to similar ISSB quantitative items.
Q9. Walk 6 km at 3 km/h and 6 km at 6 km/h. Total time?
Answer: 3 h
Explanation: First leg 2 hours plus second leg 1 hour gives 3 hours total.
Q10. Train 60 km/h for 3 hours. Distance?
Answer: 180 km
Explanation: Distance equals speed times time so 60 times 3 is 180 km.
Q11. Car 80 km/h for 45 minutes. Distance?
Answer: 60 km
Explanation: Forty five minutes is 3/4 hour so 80 times 3/4 equals 60 km.
Q12. Two trains 40 km/h and 60 km/h same direction. Relative speed?
Answer: 20 km/h
Explanation: Same direction subtract speeds so 60 minus 40 equals 20 km/h. Apply the same method to similar ISSB quantitative items.
Q13. Boat 8 km/h in still water, downstream 3 km/h stream. Downstream speed?
Answer: 11 km/h
Explanation: Downstream speed is boat plus stream so 11 km/h. Apply the same method to similar ISSB quantitative items.
Q14. A walks 5 km/h, B runs 10 km/h. B catches A with 3 km head start in?
Answer: 0.6 h
Explanation: Relative speed 5 km/h closes 3 km gap in 0.6 hours. Apply the same method to similar ISSB quantitative items.
Q15. Cyclist 24 km/h for 1.5 h then 16 km/h for 1 h. Average speed?
Answer: 20 km/h
Explanation: Total 52 km in 2.5 hours gives average speed 20.8 about 21.
Q16. Train 84 km/h for 30 minutes. Distance?
Answer: 42 km
Explanation: Thirty minutes is 1/2 hour so 84 times 1/2 equals 42 km.
Q17. Man rows 7 km/h in still water, stream 2 km/h. Upstream speed?
Answer: 5 km/h
Explanation: Upstream speed is rowing minus stream so 5 km/h. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q18. Relative speed opposite direction 85 and 65 km/h?
Answer: 150 km/h
Explanation: Opposite directions add speeds so 85 plus 65 equals 150. Work each step carefully; ISSB math rewards accuracy under time pressure.
Q19. A train 180 m long passes pole in 12 s. Speed?
Answer: 15 m/s
Explanation: Speed equals distance over time so 180 divided by 12 is 15 m/s.
Q20. Two cars 120 km apart approach at 60 and 40 km/h. Meet in?
Answer: 1.2 h
Explanation: Combined speed 100 km/h closes 120 km in 1.2 hours. Work each step carefully; ISSB math rewards accuracy under time pressure.