A flagstaff $17.5$ m high casts a shadow of length $40.25$ m. The height of the building, which casts a shadow of length $28.75$ m under similar condition will be?

The angle of elevation of the sun, when the length of the shadow of a tree is $3$ times the height of the tree, is $30^\circ{}$ $45^\circ{}$ $60^\circ{}$ $90^\circ{}$

A train running at the speed of $60$ km/hr crosses a pole in $9$ seconds. What is the length of the train? $120$ meters $180$ meters $324$ meters $150$ meters

The percentage profit earned by selling an article for Rs. $1,920$ is equal to the percentage loss incurred by selling the same article for Rs. $1,280$. At what price should the article be sold to make $25\%$ profit? Rs $2,000$ Rs $2,200$ Rs $2,400$ Data inadequate

A boatman goes $2$ km against the current of the stream in $1$ hour and goes $1$ km along the current in $10$ minutes. How long will it take to go $5$ km in stationary water? $40$ minutes $1$ hour $1$ hr $15$ min $1$ hr $30$ min