Races and Games in Maths
Posted by
Ravi Kumar at Wednesday, March 11, 2009
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Races:
A contest of speed in running ,riding,driving,sailing or
rowing is called a Race
Race Course:
The ground or path on which contests are made is called
a race course
Starting Point:
The point from which a race begins is called starting point.
Winning point or goal:
The point set to bound a race is called a winning point.
Dead Heat Race:
If all the persons contesting a race reach the goal exactly
at the same time,then the race is called a dead heat race.
Start:
Suppose A and B are two contestants in a race .If before the
start of the race,A is at the starting point and B is ahead
of A by 12 meters. Then we say that "A gives B a start 12 meters.
>To cover a race of 100metres in this case,A will have to cover
100m while B will have to cover 88m=(10012)
>In a100m race 'A can give B 12m' or 'A can give B a start of
12m' or 'A beats B by 12m'means that while A runs 100m B runs 88m.
Games:
A game of 100m,means that the person among the contestants who
scores 100 points first is the winner.
If A scores 100 points while B scores only 80 points then we say
that 'A can give B 20 points'.
Some example problems:
1) In a 1 km race,A beats B by 28 m or 7sec.Find A's time over the
course?
Sol: B covers 28 m in 7sec so,B's time over the course
= 7/28 *1000 =250 sec
A's time over the course =2507 =243 sec = 4min ,3 sec.
2) A runs 1 3/4 times as fast as B.If A gives B a start of 84 m,how
far must be winning post be so that A and B might reach it at the
same time ?
Sol: Ratio of rates of A:B =7/4 :1 =7 :4 In a game of
7 m A gains 3m over B. 3m are gained by A in a race of 7m 84 m are
gained by A in a race of 7*84/3 =196 m Winning post must be 196m
away from the starting point.
3)A can run 1km in 3 min ,10sec and B can cover same distance in
3 min 20 sec. By what distance A beat B?
Sol: clearly A beats B by
10 sec. Distance covered by B in 10 sec =1000/200 *10 =50 m A beats
B by 50 meters.