question_answer

A person standing on the bank of a river observes that the angle of elevation of the top of a tower on the opposite bank is\[\text{3}0{}^\circ \]. He moves 40 m towards the bank and finds the angle of elevation to be\[\text{6}0{}^\circ \]. What is the width of the river?

A) 24 m                                     

B) 20 m

C) 26 m                     

D)        15 m