Question

a train travels at a certain average speed of distance of 54 km and then travels a distance of 63 km at an average speed of 6 km/hr more than its original speed.if it take 3 hours to com[let the total journey , what is the original average speed ]

Answer 1

we know that distance = speed * time.

let the original speed be x

ATQ

54/x+63/x+6=3

x2-33x-108= 0

(x-36)(x+3)..

, therefore the original speed is 36 km/ hr