Juhi travelled a distance of 16 km by bicycle at the speed of 15 km per hour, 20 km by scooter at the speed of 50 km per hour and 50 km by car at the speed of 60 km per hour. The total time (in minutes) to travel these distances was
(A) 144
(b) 138
(c) 88
(d) 114
Answer: (b) 138 min
Solution:-
Juhi traveled a distance of 16 km by bicycle at the speed of 15 km per hour.
Then, time taken by Juhi = 16 x 60/15
= 16 x 4
= 64 min
She travel 20 km by scooter at the speed of 50 km per hour,
Then, Time taken by her to travel 20 km = 20 x 60/50
= 24 min
She travel 50 km by the car at the speed of 60 km per hour,
Then, time taken by her to travel 50 km = 50 x 60 /60
= 50 mjn
Total time taken by Juhi to travel whole journey = 64 + 24 + 50
= 138 min
Hence, the correct answer is option (b) 138 min.