SSC CGL Time Speed Distance Verified Practice Test 6

1. Downstream speed is 20 km/h and upstream speed is 12 km/h. Speed in still water is:

• A. 14 km/h
• B. 15 km/h
• C. 16 km/h (Correct)
• D. 17 km/h

Explanation: Still water speed = (20 + 12)/2.

2. Two trains run opposite each other at 45 km/h and 63 km/h and cross in 10 seconds. Total length is:

• A. 250 m
• B. 275 m
• C. 300 m (Correct)
• D. 325 m

Explanation: Relative speed = 108 km/h = 30 m/s.

3. 90 km/h equals:

• A. 20 m/s
• B. 25 m/s (Correct)
• C. 30 m/s
• D. 35 m/s

Explanation: Multiply by 5/18.

4. A person travels 60 km at 30 km/h and returns at 20 km/h. Average speed is:

• A. 22 km/h
• B. 24 km/h (Correct)
• C. 25 km/h
• D. 26 km/h

Explanation: Average speed for equal distances = 2ab/(a+b).

5. If speed increases by 20%, time decreases by:

• A. 15%
• B. 16.67% (Correct)
• C. 18%
• D. 20%

Explanation: New time = 1/1.2 of old time.

6. A 100 m train crosses a man standing on the platform in 5 seconds. Speed is:

• A. 18 km/h
• B. 54 km/h
• C. 72 km/h (Correct)
• D. 90 km/h

Explanation: Speed = 100/5 = 20 m/s = 72 km/h.

7. A boat covers 24 km downstream in 2 hours and upstream in 3 hours. Speed in still water is:

• A. 8 km/h
• B. 9 km/h
• C. 10 km/h (Correct)
• D. 11 km/h

Explanation: Downstream = 12, upstream = 8, so still water speed = 10.

8. A runner covers 600 m in 75 seconds. Speed is:

• A. 6 m/s
• B. 7 m/s
• C. 8 m/s (Correct)
• D. 9 m/s

Explanation: 600/75 = 8 m/s.

9. A car travels 180 km in 4 hours. Speed is:

• A. 40 km/h
• B. 42 km/h
• C. 45 km/h (Correct)
• D. 50 km/h

Explanation: Speed=180/4=45 km/h.

10. A 120m train crosses a pole in 6 seconds. Speed in km/h:

• A. 60
• B. 66
• C. 72 (Correct)
• D. 78

Explanation: Speed=120/6=20 m/s=72 km/h.

11. Boat speed in still water is 10 km/h, river current is 2 km/h. Upstream speed is:

• A. 6 km/h
• B. 7 km/h
• C. 8 km/h (Correct)
• D. 9 km/h

Explanation: Upstream=10−2=8 km/h.

12. Two trains of 100m and 80m run at 60 km/h and 40 km/h in opposite directions. Time to pass each other:

• A. 6.48 s (Correct)
• B. 7 s
• C. 7.2 s
• D. 8 s

Explanation: Relative speed = 100 km/h = 250/9 m/s. Total distance = 180 m. Time = 180 ÷ (250/9) = 6.48 seconds.

13. A travels 120 km at 40 km/h and next 120 km at 60 km/h. Average speed:

• A. 45 km/h
• B. 48 km/h (Correct)
• C. 50 km/h
• D. 52 km/h

Explanation: Total time=3+2=5 hours. Avg=240/5=48 km/h.

14. A boat goes 30 km downstream in 2 hours and 20 km upstream in 2.5 hours. Speed of stream is:

• A. 2.5 km/h
• B. 3 km/h
• C. 3.5 km/h (Correct)
• D. 4 km/h

Explanation: Downstream speed = 15 km/h and upstream speed = 8 km/h. Stream speed = (15 - 8) / 2 = 3.5 km/h.

15. A train 200m long crosses a bridge 400m long at 60 km/h. Time to cross:

• A. 32 s
• B. 34 s
• C. 36 s (Correct)
• D. 38 s

Explanation: Total distance=600m. Speed=60km/h=50/3 m/s. Time=600÷(50/3)=36 s.