Question

Riya is going from her home to school by foot. The distance of her school from her home is 3km. As the weather is becoming bad , she started walking faster . If she increased her speed 1 km/ hr more , she would have taken 15 minutes less to cover the same distance . Find her original speed ?

Give step by step solution and Correct Answer
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Answer 1

Answer:

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Answer 2

Step-by-step explanation:

let the speed be Xkm

and time be T

X=3/T

X+1=3/T-15/60

X+1=3/4T-1/4

X+1=12/4T-1

(X+1)(4T-1)=12

4XT-X+4T-1=12

12-X+4T-1=12

4T-X=1

4T-3/T=1

4T^2-T-3=0

4T^2-4T+3T-3=0

(4T+1)(T-1)=0

T=1 T= -1/4

ORIGINAL SPEED=3KM/H