A. 20/6 hours
B. 27/2 hours
C. 30 hours
D. 30/13 hours
✅ The correct answer is option D. 30/13 hours.
295. The probability that a number selected at random from the first 50 natural numbers is a composite number is__________?
A. 21/25
B. 17/25
C. 4/25
D. 8/25
✅ The correct answer is option B. 17/25.
The largest size of bamboo that can be placed in a square of area 100 sq.meters is__________?
A. 10m
B. 14.14m
C. 20m
D. 25m
✅ The correct answer is option B. 14.14m.
A man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?
A. 8 kmph
B. 4 kmph
C. 2 kmph
D. 10 kmph
✅ The correct answer is option B. 4 kmph.
The perimeter of a rectangle is 60m. If it’s length is twice its breadth then its area is__________?
A. 160m2
B. 180m2
C. 200m2
D. 220m2
✅ The correct answer is option C. 200m2.
A man can row three-quarters of a kilometer against the stream in 11 ¼ minutes and return in 7 ½ minutes. The speed of the man in still water is________?
A. 2km/hr
B. 3km/hr
C. 4 km/hr
D. 5 km/hr
✅ The correct answer is option D. 5 km/hr.
284. The surface area of a cube is 726m2, its volume is?
A. 1300 m3
B. 1331 m3
C. 1452 m3
D. 1542 m3
✅ The correct answer is option B. 1331 m3.
6a2 = 726
6a2 = 726
282. An article is bought for Rs.675 and sold for Rs.900, find the gain percent?
A. 16 2/3%
B. 30%
C. 33 1/3%
D. 33 1/6%
✅ The correct answer is option C. 33 1/3%.
280. A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
A. 8.2
B. 4.2
C. 6.1
D. 7.2
✅ The correct answer is option D. 7.2.
278. Walking at 80% of his usual speed, a man is 10 mins late to his office. Find the usual time taken by hime to reach his office.
A. 20 minutes
B. 30 minutes
C. 40 minutes
D. 50 minutes
✅ The correct answer is option C. 40 minutes.
Let his
Let his
usual speed be x kmph
usual travel time be t hours
distance to office be d km d=xt d=(0.8x)*[t+(10/60)] xt=0.8xt+(2x/15) Solving,
t=40 minutes