Question

A and b are traveling in the same direction. B is traveling at a constant speed of 55kmph and the distance between a and b is 1.5 km. If a crosses b within 1 minute, what is the speed of a?

Answer 1

Hope u will be undedstand clearly

Answer 2

Answer:

35 km/hr

Step-by-step explanation:

Distance between A and B = 1.5 km

Speed of B = 55 km/hr

Let The speed of A be x km/hr

Relative speed = Differences in speed = 55-x

So, Speed = 55-x

Distance = 1.5

Time  = $\frac{Distance}{Speed}$

Time of crossing = $\frac{1.5}{55-x}$

We are given that a crosses b within 1 minute

So, $\frac{1.5}{55-x}=\frac{1}{60}$

$60 \times 1.5=55-x$

$90=55-x$

$90=55-x$

x=-35

So, speed of a towards B is 35 km/hr.