Question

2. A motorist covers a certain distance at a average speed of 48 km/h in 45 minutes. What speed in km/h he must maintain to cover the same distance in 30 minutes ? (b) 79 km/h (C) 80 km/h (d) 72 km/h (a) 66 km/h​

Answer 1

d

1st case

time in hr....3/4 hr

so,

s=48×3/4=36 km

time in 2nd case=1/2hr

v= (36)/1/2 =72

Answer 2

Answer:

let required speed be x km/hr ,then

x multiple of 1/

Explanation: