Question
A boat is being rowed away from a cliff 240 m high. From
the top of the cliff, the angle of depression of the boat changes from 60° to 45° in 3 minutes. What is the speed of the boat?Solution
According to the figure above: tan 45° = 240/(a + b) ⇒ 1 = 240/(a + b) ⇒ a + b = 240 Also, tan 60° = 240/a ⇒ √ 3 = 240/a ⇒ a = 240/ √ 3 ⇒ a = 80√ 3 = 138.5 ∴ b = 240 - 138.5 = 101.5 ⇒ The boat covers a distance of 101.5 m in 3 minutes. ∴ Speed of the boat = (101.5 x 60)/(3 x 1000) km/h = 2.03 km/h
The plans _____________ several revolutionary new concepts whichmust be kept top secret.
Select the most appropriate option to complete the sentence.
The committee did not acknowledge that he __________ wrong.
As the storm approached, residents were urged to ____________ their homes and take shelter to ensure their safety.
- In the following questions, each sentence has two blanks. Choose the appropriate set of words for the blanks that best fits in the context of the sentence....
So, for four hours she sat ____________ about Harry and fleshing out all the characters in the book.
In the following questions, each sentence has two blanks. Choose the appropriate set of words for the blanks that best fits in the context of the sente...
In the following questions, a sentence is given with two blanks. Identify the correct pair of words that fit in the sentence to make it grammatically a...
Though migration of healthcare workers abroad is often ______________ as one of the foremost reasons for shortage of personnel, about a quarter of medic...
Many of the visitors in Kochi ________ conventional hotels and resorts, choosing to stay with fishermen________. Via these home stays, which are ______...
In the following question, an incomplete statement followed by fillers is given. Pick out the best filler to complete the incomplete statement, correc...
Relevant for Exams:
