Time, Work & Speed

90 questions available

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All Time & Work 26 Work & Efficiency 3 Pipes & Cisterns Speed, Distance & Time 57 Average Speed Trains 4 Boats & Streams
Showing 81–90 of 90

Q81.A car covers 150 km in 3 hours, what is its average speed? (Speed check)

Medium
A 45 km/h
B 50 km/h
C 60 km/h
D 55 km/h
Speed, Distance & Time PPSC

Correct Answer: B

Average Speed = Distance / Time = 150 / 3 = 50 km/h.

Q82.If 10 men earn 500 units of money in 4 days, how much will 8 men earn in 6 days?

Medium
A 450
B 600
C 700
D 750
Time & Work PPSC

Correct Answer: B

Total work = 10 men * 4 days = 40 man-days. Earning per man-day = 500 / 40 = 12.5. Earning for 8 men in 6 days = 8 * 6 * 12.5 = 600.

Q83.If 4 mat-weavers can weave 4 mats in 4 days, how many mats would be woven by 8 mat-weavers in 4 days at the same rate?

Medium
A 8
B 16
C 12
D None of these
Time & Work PPSC

Correct Answer: A

4 weavers weave 4 mats in 4 days means 1 weaver weaves 1 mat in 4 days. Therefore, 8 weavers working for 4 days will weave 8 mats.

Q84.A car travels 30km at a uniform speed of 40km/h and the next 30km at a uniform speed of 20km/h. Find its average speed.

Medium
A 28.7 km/h
B 26.7 km/h
C 26.5 km/h
D 25.4 km/h
Speed, Distance & Time PPSC

Correct Answer: B

Total distance = 60km. Total time = 30/40 + 30/20 = 0.75 + 1.5 = 2.25 hours. Average speed = 60 / 2.25 = 26.67 km/h.

Q85.30 labourers working 7 hours a day can finish a work in 18 days. If they work 6 hours a day, how many labourers are needed to finish it in 30 days?

Medium
A 16
B 18
C 20
D 21
Time & Work PPSC

Correct Answer: D

Total man-hours required = 30 x 7 x 18 = 3780. Working 6 hours for 30 days gives 180 hours/man. Required labourers = 3780 / 180 = 21.

Q86.12 men working 8 hours a day complete a work in 10 days. To complete the same work in 8 days working 15 hours a day, how many men are required?

Medium
A 6
B 8
C 10
D 12
Time & Work PPSC

Correct Answer: B

Total man-hours = 12 x 8 x 10 = 960. For the new schedule: 8 days x 15 hours = 120 hours. Required men = 960 / 120 = 8.

Q87.Shaista completes a work in 10 days, and Ali completes it in 40 days. If they work together, how many days will they take?

Medium
A 6 days
B 8 days
C 10 days
D 16 days
Time & Work PPSC

Correct Answer: B

Combined work rate = 1/10 + 1/40 = 5/40 = 1/8. So it will take 8 days to complete working together.

Q88.If 3 persons do 3 times a work in 3 days, then 7 persons can do 7 times that work in how many days?

Medium
A 3 days
B 5 days
C 6 days
D 7 days
Time & Work PPSC

Correct Answer: A

Efficacy: 3 persons do 3 jobs in 3 days, meaning 3 persons do 1 job in 1 day, or 1 person does 1 job in 3 days. Thus, 7 persons can do 7 jobs in 3 days.

Q89.If 4 men can color 48m of cloth in 2 days, how many days will 6 men take to color 36m of cloth?

Medium
A 3/4 days
B 1 day
C 1 1/2 days
D 2 days
Time & Work PPSC

Correct Answer: B

Rate of coloring = 48 / (4 x 2) = 6 meters per man-day. For 6 men to color 36m: 36 / (6 x 6) = 1 day.

Q90.If a plane travels at 90 km/hour, how much distance will it cover in 35 minutes?

Medium
A 58 km
B 60 km
C 52.5 km
D None of these
Speed, Distance & Time PPSC

Correct Answer: C

Distance = Speed * Time. 35 minutes = 35/60 hours. Distance = 90 * (35/60) = 52.5 km.