Question

The multiplex is 120 km from their starting point. was away . Kareena and Arjun a car whose speed is 50 km. / Hr. Started the journey from him while Ajay took a leg whose speed was 10 km. / Hr. After some time, Arjun got down from the car and the rest of the distance he would hang another one, whose speed was 10 km. / Hr. Decided from Thi. While Kareena turned her car back and reached Ajay on the way at the same time when Arjun had reached, was the time taken to decide the entire journey? A 4 hours B. 5 hours C 4.8 hours D 6 hours​

Answer 1

Step-by-step explanation:

options b is the correct

Answer 2

Step-by-step explanation:

Given The multiplex is 120 km from their starting point. was away . Kareena and Arjun a car whose speed is 50 km. / Hr. Started the journey from him while Ajay took a leg whose speed was 10 km. / Hr. After some time, Arjun got down from the car and the rest of the distance he would hang another one, whose speed was 10 km. / Hr. Decided from Thi. While Kareena turned her car back and reached Ajay on the way at the same time when Arjun had reached, was the time taken to decide the entire journey?

• Now let the smaller speed be V1 = 10 km/hr
•      Let the bigger speed be  V2 = 50 km/hr
•    Total Distance D = 120 km
• speed factor will be k = 50 – 10 / 50 + 10
•                               = 40 /  60
•                               = 2/3
• Now total time = D (2 + k) / [ (1 + k) V1 + V2]
•                          = 120 (2 + 2/3) / [(1 + 2/3) 10 + 50 ]
•                         = 120 (8/3) (5/3 x 10 + 50)
•                         = 320 / 50 / 3 + 50
•                         = 320 x 3 / 200
•                           = 24 / 5
•                              = 4.8 hrs
• Therefore the total time is 4.8 hrs

Reference link will be

https://brainly.in/question/9241602