1
GATE ECE 2019
+1
-0.33
It would take one machine 4 hours to complete a production order and another machine 2 hours to complete the same order. If both machine work simultaneously at their respective constant rates, the time taken to complete the same order is _______ hours.
A
$${4 \over 3}$$
B
$${3 \over 4}$$
C
$${2 \over 3}$$
D
$${7 \over 3}$$
2
GATE ECE 2018
+1
-0.33
If the number 715 ■ 423 is divisible by 3 (■ denotes the missing digit in the thousandths place), then the smallest whole number in the place of ■ is _______.
A
2
B
0
C
6
D
5
3
GATE ECE 2018
+1
-0.33
A 1.5 m tall person is standing at a distance of 3 m from a lamp post. The light from the lamp at the top of the post casts her shadow. The length of the shadow is twice her height. What is the height of the lamp post in meters?
A
1.5
B
3
C
4.5
D
6
4
GATE ECE 2018
+1
-0.33
What is the value of $$1 + {1 \over 4} + {1 \over {16}} + {1 \over {64}} + {1 \over {256}} + ......$$?
A
$${7 \over 4}$$
B
$${3 \over 2}$$
C
$${4 \over 3}$$
D
2
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