A motorist covers a distance of 39km in 45min by moving at a speed of xkmph for the
first 15min.then moving at double the speed for the next 20 min and then again moving at
his original speed for the rest of the journey .then x=?
36kmph
44kmph
42kmph
55kmph
Explanation:
Total distance = 39 km
Total time = 45 min
D = S*T
x * 15/60 + 2x * 20/60 + x * 10/60 = 39 km
x = 36 kmph
Total distance = 39 km
Total time = 45 min
D = S*T
x * 15/60 + 2x * 20/60 + x * 10/60 = 39 km
x = 36 kmph