Question
A is cycling at an average speed of 20 km/hr such that
he can reach a certain point at 12 noon. If he cycles at 60 km/hr, then he will reach the destination at 10 a.m. At what speed he should cycle to reach the destination at 11 a.m.Solution
Let the distance to be travelled be ‘x’ km Time taken when speed is 20 km/hr = (x/20) hours Time taken when speed is 60 km/hr = (x/60) hours According to the question, (x/20) – (x/60) = 2 Or, 3x – x = 2 × 60 Or, 2x = 120 km Or, x = 60 km Time taken to travel 60 km with speed of 20 km/hr = 60/20 = 3 hours Therefore, he started at 12 – 3 = 9 a.m. Therefore, required speed to reach the destination at 11 a.m. or 2 hours = 60/2 = 30 km/hr
Which of the following potential is always negative?
In CRD design the degree of freedom for error is calculated by which formula?
Marconi wheat is known as:
Which crop is called 'camel crop"?
The synthesis of ATP via electron flow through the ETS, with oxygen as the terminal electron  acceptor,   is  known...
According to latest Final estimates of Foodgrain production 2023-24, Which state is the largest producer of sugarcane in India?
Tikka disease of groundnut spreads fast under the conditions of:
Pradhan Mantri Krishi Sinchai Yojana (PMKSY) was launched in the year___
What is the meaning of the word "Chrysanthemum," as derived from its etymology?
Of which South-East-Asian country did Joko Widodo become the President in 2019 for the second time?
