Question

two vehicles start from the same point with velocity 10kmph and 30kmph along two roads. If angle between the tracks is 60 degree, determine the distance between the vehicles after 12 minutes.
a)40 km
b)8 km
c)4 km
d)2×root 7​

Answer 1

Answer:

option C...... but I am not sure

Answer 2

Explanation:

Let 2 vehiclesbe A and B

now,for vehicleA

Speed =10km/hr, time =12 min 1/5hrs

dis=10*0.2=2 km

for vehicle B

speed=30km/hr, time=12min=1/5hrs

distance=30*(1/5)=6km

Using Cosine law,

Cos60°=(2²+6²-s²)/2*2*6 (where s is required distace

1/2=(40-s²)/24

12= 40- s²

s²=28

s=2*root7