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 .
Answer & explanation
Correct answer: option 3
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