If Rahim walks at 14 km/hr instead of 10 km/hr for a certain time, he would have walked 30 km more. if Rahim walks at a speed of 10 km/hr, the distance travelled by him within that time is-

Question: If Rahim walks at 14 km/hr instead of 10 km/hr for a certain time, he would have walked 30 km more. if Rahim walks at a speed of 10 km/hr, the distance travelled by him within that time is-

Solution:
Let,
the actual distance travelled be = a km.

Then,
a/10 = (a + 30)/14
⇒ 14a = 10a + 300
⇒ 14a - 10a = 300
⇒ 4a = 300
⇒ a = 300/4
∴ a = 75 km