41. At 3.40, the hour hand and the minute hand of a clock form an angle of?
Answer:
Explanation:In 60 min, min hand moves by 360 deg
and hr hand moves by 30 deg.
In 40 min, hr hand moves by 20 deg...wrt 3/0 clock position and 110 deg w.r.t 12'o clock position.
In 40 min, min hand moves by 240 deg.... w.r.t 12 'o clock position.
angle between min and hr hand = 240-110 = 130 deg
Workspace
Hexaware Technologies
42. The sum of the digits of a two digit number is 8. If the digits are reversed the number is decreased by 54. Find the number.
Answer:
Explanation:given a+b=8-->1
10b+a=a+10a-54(- bcoz reverse of digit dec by 54)-->2
from a+b=8
a=8-b sub this in eq 2
then we get 18b=18
b=1
a=7
so original numb is 71
Workspace
Hexaware Technologies
43. The ratio of two numbers is 2/3, and if a 1 is subtracted from the numerator and a 1 is added to the remainder the ratio becomes 1/2, then the numbers are.
Answer:
Explanation:a:b=2:3 b=3/2a
a-1/b+1=1/2
solving this we get a=6 and b=9
Workspace
Hexaware Technologies
44. A student is ranked 13th from right and 8th from left. How many are there?
Answer:
Explanation:20 are there.
13th from right means = x + 12
8th from left means = 7 + x
Total = 12+7+1 = 20
Workspace
Hexaware Technologies
45. A train travels at an average of 50 miles per hour for 2x1/2 hours and then travels at a speed of 70 miles per hour for 1x1/2 hours. How far did the train travels in the entire 4 hours?
Answer:
Explanation:total distance=50*5/2+70*3/2= 230miles
Workspace
Hexaware Technologies
46. Number of Weights needed for weighing 1 to 40 kgs?
Answer:
Explanation:4 weights
1,3,9,27 kg
Workspace
Hexaware Technologies
47. If 5 men take an hour to dig a ditch, then how long should 12 men take a dig to ditch of the same type?
Answer:
Explanation:If 5 men take an hour to dig a ditch, then
12 men will take 5*60/12 = 25 mins to dig a ditch of the same type.
Workspace
Hexaware Technologies
48. If A and B can do a piece of work in 10 days and A alone can do it in 15 days, how long will B take to do it?
Answer:
Explanation:A+B=1/10
A=1/15
so,B=1/10-1/15=1/30
B take 30 days.
Workspace
Hexaware Technologies
49. An athlete runs 200 metres race in 24 seconds. His speed is
Answer:
Explanation:speed = distance/time
speed=200/24 = 8.3 m/s
convert into km/hr =8.3*18/5 = 29.88
answer is 30 km/hr
Workspace
Hexaware Technologies
50. If A and B run on a circular path in opposite directions of constant speeds with different velocities from P and Q. First time they meet 800 mts away from P and second time they meet 700 mts away from P, what is the lenght of the circular path.
Answer:
Explanation:800 +800+700= 2300 meters
Workspace
Hexaware Technologies
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