Question

Jogging at their normal speeds, Usha takes 3 minutes to jog once around a running track, while Tessie takes 4 minutes to do the same.
If Usha's normal jogging speed is 12 km/hr, what is Tessie's normal jogging speed?
A
9 km/hr
B
15 km/hr
C
16 km/hr
D
Not possible to find from the information given

Answer 1

Given : Jogging at their normal speeds, Usha takes 3 minutes to jog once around a running track,  

Tessie takes 4 minutes to do the same.  

 Usha's normal jogging speed is 12 km/hr,

To Find : Tessie's normal jogging speed

A   9 km/hr

B   15 km/hr

C   16 km/hr

D   Not possible to find from the information given

Solution:

Usha takes 3 minutes to jog once around a running track,  

Let say Track length = 12L m

Usha speed = 12L/3  =  4L m/s

Tessie takes 4 minutes  to jog once around a running track,  

Tessie speed = 12L/4  =  3L m/s

Usha speed : Tessie speed  = 4L : 3L

=> Usha speed : Tessie speed  = 4  : 3

Usha's normal jogging speed is 12 km/hr,

Tessie's normal jogging speed  = T km/hr

=> 4/3  = 12/T

=> T = 9 km/hr

Tessie's normal jogging speed = 9 km/hr

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