Question

a train travels a distance of 46 km in 2 hrs and then 29 km in 4 hours calculate the average speed of train .​

Answer 1

Answer:

your answer feiend hope it helps

Explanation:

Distance =54 km

Let the average speed be x

Distance =63 km

The average speed to cover this distance =x+6

Total time taken =3 hr

t=

S

D

∴

x

54

+

x+6

63

=3

⇒

x(x+6)

54(x+6)+63x

=3

⇒54x+324+63x=3x

2

+18x

⇒3x

2

−99x−324=0

⇒x

2

−33x−108=0

⇒x

2

−36x+3x−108=0

⇒x(x−36)+3(x−36)=0

⇒(x−36)(x+3)=0

Then x=36 and x=−3

x=−3 is not admissible because it is negative

Then x=36

So speed =36 km/hr