Question

a train covers first 100 m in 2 hours and the next 100 m in 1 hour. calculate its average speed .

Answer 1

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Here is your answer
For first 100 m

Speed = Distance/Time
$= \frac{100}{2} \\ = 50m \: perhr$
For next 100 m
Time = 1 hr

Speed =
$= \frac{100}{1} \\ = 100 \: m \: per \: hr$
Total Average Speed = 100 + 50
= 150 m / hr


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Answer 2

ANSWER


First we discuss about average speed


AVERAGE SPEED =>


It is defined as total distance travelled by an object to total time taken.


$average \: speed \: = \: \frac{total \: distance}{total \: time \: taken}$



NOW SOLUTION


GIVEN

D(1) = 100

T(1) =2 hr

D(2)= 100

T(2)=1hr



$s(1) = \frac{d(1)}{t(1)}$

$s(1) = \frac{100m}{2hr}$

$s(1) = 50m {h}^{ - 1}$

Now find second speed


$s(2) = \frac{d(2)}{t(2)}$

$s(2) = \frac{100m}{1hr}$

$s(2) = 100m {hr}^{ - 1}$


TOTAL SPEED = s(1)+s(2)


= 100+50

=150m{hr}^{-1}