Question

Question 55
Amit travelled from A to B at an average speed of 80 km/h. He travelled the first 75% of the distance in
two-third of the time andthe rest at a constant speed of x km/h. The value of is:
A
56
B
54
C
60
Answer: 0​

Answer 1

value of x = 60 km/hr

Step-by-step explanation:

Let say Distance Traveled = 4D km

& Time Taken  = 3T hr

Speed = Distance / time = 80

=> 4D/3T = 80

=> D = 60T

first 75% of the distance = (75/100)4D = 3D  km

two third of the time = (2/3)3T = 2T

Speed = 3D/2T  = 3 * 60T /2T = 90 km/hr

Remaining Distance = 3D - 2D = D km

Remaining time = 3T - 2T = T hr

Speed = x = D/T  => 60T/T = 60

value of x = 60 km/hr