Solution for yesterday’s problem
Let ‘t’ be the usual time in minutes
By supposition, 30(t+10)=42(t-10)
In 60 minutes the man travels 30 km. Therefore, in 70 minutes he will travel 35 km which is the distance he covers to reach the destination.
Other method 1
(30*10+42*10)/(42-30)=60 minutes (usual time)
Other method 2
A man bought two horses for $1440. He sold one at a gain of 15% and the other at a loss of 8% and it was found that each horse fetched him the same amount. Find the cost price of the second horse. (Asked by Preeti)