Question

2. During the first 18 min of a 60 min trip, a car has an average
speed of 11 ms. What should be the average speed for
remaining 42 min so that car is having an average speed of
21ms for the entire trip?
(a) 25.3 ms-'
(b) 29.2 ms-'
(C) 31 ms-'
(d) 35.6 ms -​

Answer 1

Answer:

c

Explanation:

avg spd=avg speed at 1st half +avg speed at second half

21=11/2 + x/2

x=42-11

x=33

where,x=avg speed during second half.