Question

after 15 years mary's age will be four times of her present age .find her present age.
2.if a train runs at 40 km per hour it reaches its destination late by 11 minutes.but if it runs at 50km per hour it is late by 5 minutes only.find the distance to be coverred by the train .

Answer 1

let the present age of marry be x
ACC/ques
after 15years he age will be 15+x which is 4time he present age i.e. 4x
now 15+x=4x
15=3x
x=5
hence Marty's present age is 5 years

Answer 2

please refer to the attachment


Hope it will help you