A person covers a certain distance with certain speed if he increases his speed by 04 km/hr then he reach 10 min early . Find the time taken by man with his initial speed , if his initial speed is 36 km/hr .
Answer & explanation
Correct answer: option 3
Initial speed = 36 km/hr
And speed increases by 4 km/hr ,
Increased speed = ( 36 + 4 ) km/hr= 40 km/hr
Ratio initial speed : increased speed
36 : 40
speed 9 : 10
time 10 : 9
( Distance = Speed × Time , so ratio of speed and time is inverse to each other )
According to question , ( 10 - 9 )R = 1R = 10 min
Time taken with initial speed = 10 × 10 = 100 min