Question

Deepa rises her bike at an average speed of 30 km/hr and reaches her destination in 6 hrs . Hema covers the same distance in 4 hrs . If Deepa increases her average speed by 10km/hr and Hema increases her average speed by 5 km/hr , what would be the difference in their time taken to reach the destination ?
A. 54 minutes
B. 1 hour
C. 40 minutes
D. 45 minutes

Answer 1

Correct Answer - A
Total distance = 180 km
`therefore` Speed of Hema = 45 km/hr
New speed of Deepa = 40 km/hr
Time = `(180)/(40)` = 4 hr 30 min
New speed of Hema = 50 km/hr
Time = `(180)/(50) ` = 3 hr 36 min
`therefore` Difference in time = 54 min