alleryStart learning →Convert a speed of $90$ km/hr into metres per second.
- $18$ m/s
- $22.5$ m/s
- $25$ m/s
- $27$ m/s
Show answer and solution
Correct answer: C. $25$ m/s
Multiply km/hr by $\dfrac{5}{18}$: $90 \times \dfrac{5}{18} = 25$ m/s.
MP Police SI Profit Loss — practice questions
Explore 40 free Profit Loss questions in MP Police SI Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
Practise Profit Loss with Quill →Profit Loss questions and exercises with answers
Showing questions 1–30 of 40.
Convert a speed of $90$ km/hr into metres per second.Read the answer and worked solution →A car covers $360$ km in $4$ hours. Find its average speed.Read the answer and worked solution →A man travels the first half of a journey at $30$ km/hr and the second half at $60$ km/hr. Find his average speed for the whole journey.Read the answer and worked solution →If the ratio of the speeds of A and B is $3 : 4$, what is the ratio of the times they take to cover the same distance?Read the answer and worked solution →Bishan cycled 120 km at a fixed speed. Had he cycled 3 km/hr slower, he would have taken 2 hours more to reach the destination. Find his actual speed in km/hr.Read the answer and worked solution →Complete the definition of discountRead the answer and worked solution →Discount worked outRead the answer and worked solution →Which price does this belong to?Read the answer and worked solution →True or false: overhead expensesRead the answer and worked solution →Complete the sales tax ruleRead the answer and worked solution →True or false: tax, VAT and GSTRead the answer and worked solution →Added on top, or already inside the price?Read the answer and worked solution →Order the steps: find the bill amount after taxRead the answer and worked solution →Simple interest or compound interest?Read the answer and worked solution →Simple interest worked outRead the answer and worked solution →True or false: interestRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Match each term to what it meansRead the answer and worked solution →Tap everything that goes into the cost priceRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Order the steps: from marked price to what the customer paysRead the answer and worked solution →Complete the compound interest ideaRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: reading a billRead the answer and worked solution →Who pays, and who collects?Read the answer and worked solution →Assertion and reason: pricesRead the answer and worked solution →Tap every statement true of sales taxRead the answer and worked solution →
Worked practice questions
A car covers $360$ km in $4$ hours. Find its average speed.
- $60$ km/hr
- $80$ km/hr
- $90$ km/hr
- $100$ km/hr
Show answer and solution
Correct answer: C. $90$ km/hr
Speed $= \dfrac{\text{Distance}}{\text{Time}} = \dfrac{360}{4} = 90$ km/hr.
A man travels the first half of a journey at $30$ km/hr and the second half at $60$ km/hr. Find his average speed for the whole journey.
- $35$ km/hr
- $40$ km/hr
- $45$ km/hr
- $50$ km/hr
Show answer and solution
Correct answer: B. $40$ km/hr
For equal distances, average speed is the harmonic mean: $\dfrac{2xy}{x+y} = \dfrac{2 \times 30 \times 60}{90} = \dfrac{3600}{90} = 40$ km/hr.
Not the arithmetic mean $(30 + 60)/2 = 45$ — that holds for equal *times*, not equal *distances*.
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