A person covers a certain distance with certain speed if he increases his speed by 04 km/hr then he reac 7 min early . Find the time taken by man with his increased speed ,  if his initial speed is 32 km/hr .

56 min

Initial speed = 32 km/hr 

And speed increases by 4 km/hr ,

Increased speed = ( 32 + 4 ) km/hr= 36 km/hr

Ratio             initial speed     :      increased speed

                         32             :           36 

speed                 8             :            9 

time                   9             :            8

 ( Distance = Speed × Time , so ratio of speed and time is inverse to each other  ) 

According to question , ( 9 - 8 )R =  1R = 7 min 

Time taken with increased speed = 8 × 7 = 56 min