mathematics

Parin Sir > mathematics

Aug

(16) A train 170 m long is running with a speed of 72 kmph. In what time will it pass a tunnel 230 m long ?

Soln. Speed of the train = u = $...$

Posted in: Examples 16 to 20 of Time and Distance,

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Aug

Examples 11 to 15 of Time and Distance

(11) An motor cars moves along the four sides of a square at the speeds of 20, 40, 60 and 80 km/hr. Find the average speed of the motor car around the field.

Soln. Since each side of the square be x km is same, average spee…

Posted in: Examples 11 to 15 of Time and Distance,

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Aug

Examples 6 to 10 of Time and Distance

(6) A goods train leaves a station at a certain time at a fixed speed. After 10 hours, an express train leaves the same station and moves in the same direction at a uniform speed of 120 kmph. This train catches the goods train in 5 hours. F…

Posted in: Examples 6 to 10 of Time and Distance,

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09

Aug

Examples 1 to 5 of Time and Distance
(1) Express 90 km/hr into meters/sec.

Soln. 90 km/hr = $\left(90\times\frac{5}{18}\right)$ m/sec = 25 m/sec.

(…

Posted in: Examples 1 to 5 of Time and Distance,

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08

Aug

Time And Distance
☼ Formulae ( Problems on Time, Speed & Distance ) :

■ Speed = $\frac{\mathrm{Distance}}{\mathrm{Time}}$

Posted in: Time And Distance,

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08

Aug

Index of Clocks
01. Introduction

02. General Concepts

03. Examples 1 to 4

Posted in: Index of Clocks,

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08

Aug

Examples 5 to 7 of Clocks
(5) The hands of a clock coincide after every 62 minutes of correct time. How much is the clock fast or slow in 24 hrs?

Soln. In correct clock, the time interval for coincide = 65

Posted in: Examples 5 to 7 of Clocks,

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08

Aug

Examples 1 to 4 of Clocks
(1) Find the angle between the hour hand and the minute hand of a clock when the time is 3 : 30.

Soln. Hour hand covers a distance of 3 hrs. and 30 minutes = 210 minutes and Minute hand covers a distance of 30 minutes.

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Posted in: Examples 1 to 4 of Clocks,

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08

Aug

General Concepts
☼ GENERAL CONCEPTS :

↦ It is 11 : 00 o’clock. In how many minutes both the hands will coincide ?

Soln. Our wrong answer is 55 minutes. Because we always give answer by fixing ( no movem…

Posted in: General Concepts,

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08

Aug

Clocks
☼ INTRODUCTION : We know that the person who appreciate the time, the time will appreciate him. We have mainly two hands in a watch or clock. ( Actually we have three hands, but we ignore the seconds hand because …

Posted in: Clocks,

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