Question

On a 100 kilometre track A train travels the first 30 km at a uniform speed of 30 km per hour. how

much fast must the train travel the next 70 kilometre so as to average 40 kilometre per hour for the entire tripe​

Answer 1

Explanation:

Average speed=Total distance Total time taken

V

av

=

t

d

ort=

V

av

d

For 120 km,

t=

60 km/hr

120 km

=2 hr ......(i)

For 1st 30 km,

t

1

=

30 km/hr

30 km

=1 hr

For remaining 90 km,

t

2

=t−t

1

=2−1=1 hr

speed=

time

distance

or v

2

=

t

2

d

2

=

1

90

=90 km/hr

Answer 2

Answer:

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