Question

an auto travels at a rate of 25kmph for 4 min and 50 kmph for 8 min and finally at 20kmph for 2minuts find the distance covered

Answer 1

CASE 1
speed=25kmp
time=4minute=4/60h=1/15h
distance covered=speed*time
                              =25*1/15
                              =5/3km  --------------- 1

CASE 2
speed=50kmph
time=8min=8/60h=2/15h
distance covered= speed*time 
                             =50*2/15
                             =20/3km-------------- 2

CASE 3
speed=20kmph
time=2 minutes=2/60h=1/30h
distance covered=speed*time
                             = 20*1/30
                             =2/3km---------- 3

total distance covered
(on addind eq. 1, 2 and 3)
= (5/3+20/3+2/3)km
= 27/3km

= 9km

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