A person observed that he required 30 s ...

A person observed that he required `30 s` time to cross a circular ground a long its diameter than to cover it once along the boundary. If his speed was `30m//min`, then the radius of the circular ground is

5.5 m

7.5 m

10.5 m

3.5 m

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

MENSURATION
KIRAN PUBLICATION|Exercise TYPE -II|386 Videos
MENSURATION
KIRAN PUBLICATION|Exercise TYPE - III|21 Videos
LCM AND HCF
KIRAN PUBLICATION|Exercise Test Yourself |18 Videos
MISCELLANEOUS
KIRAN PUBLICATION|Exercise TYPE-VI|15 Videos

Similar Questions

Explore conceptually related problems

A person observed that he required 30 seconds less time to cross a circular ground along its diameter than to cover it once along the boundary. If his speed was 30 m/minute, then the radius of the circular ground is (" Take " pi = 22/7) :

An athlete runs on a circular track of radius 49m and covers a distance of 3080m along its boundary.How many rounds has he taken to cover this distance?

If a particle is moving along a circle of radius 3 m with a constant speed 9 m//s , then it covers a quarter of the circle in time of

A person observed the angle of elevation of the top of a tower as 30o. He walked 50m towards the foot of the tower along level ground and found the angle of elevation of the top of the tower as 60o. Find the height of the tower.

The moment of inertia of a circular disc about its diameter is 500 kg m^(2) . If its radius is 2 m, than its radius of gyration is

8.How long would a boy take to walk once round a circular park whose diameter is 420m if his speed is 3km/h

A car of mass m wants to move on a circular turn of radius 120m with 30m/s .What should be the banking angle for circular turn ?(g=10m/s^(2))

Calculate the period of revolution of the neptune around the sun, given that diameter of its orbit is 30 times the diameter of the earth's orbit around the sun. Assume both the orbits to he circular.

KIRAN PUBLICATION-MENSURATION-Test Yourself

A person observed that he required 30 s time to cross a circular groun...
Text Solution
|
ABCD is a trapezium in which AB||CD and AB=2CD. If its diagonals inter...
Text Solution
|
ABCD is a parallelogram, E and F are the mid-points of BC and CD. Find...
Text Solution
|
Find the ratio of the areas of squares circumscribed about and inscrib...
Text Solution
|
A sphere of radius r is incribed in a right circular cone whose slant ...
Text Solution
|
The radius of each circle is 'a'. Then the area of the shaded portion ...
Text Solution
|
The length of each side of a rhombus is equal to the length of the sid...
Text Solution
|
In the figure given below, D is the diameter of each circle. What is t...
Text Solution
|
Three equal circles of unit radius touch one another. Then the area of...
Text Solution
|
Two goats tethered to diagonally opposite vertices of a field formed b...
Text Solution
|
Find the area of the triangle inscribed in a circle circumscribed by a...
Text Solution
|
From a thin metallic sheet in the shape of a trapezium ABCD in which A...
Text Solution
|
AB and CD are parallel sides of a trapezium ABCD. Its diagonals inters...
Text Solution
|
In the given figure, ABCd is a square of side 14 cm. Semicricles are d...
Text Solution
|
A figure has a square of side 40 cm wih an circle in a circumcircle. T...
Text Solution
|
A sqaure of side 4 cm is inscirbed in a circular quadrant such that on...
Text Solution
|
The sum of length and breadth of a rectangle is 16 cm. A circle is cir...
Text Solution
|
ABCD is a rhombus with side 10 cm and one of its diagonals BD equal to...
Text Solution
|
The height of an equilateral triangle is 42 cm. A circle is drawn with...
Text Solution
|
In an isosceles triangle, the lengh of each equal side is 1.5 times th...
Text Solution
|
Four circles of equal radii are inscribed in a square of side 56 cm, t...
Text Solution
|