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.
Indian Coast Guard Yantrik Basic Arithmetic — practice questions
Explore 39 free Basic Arithmetic questions in Indian Coast Guard Yantrik Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
Practise Basic Arithmetic with Quill →Basic Arithmetic questions and exercises with answers
Showing questions 1–30 of 39.
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 speed and time ruleRead the answer and worked solution →Which pair varies which way?Read the answer and worked solution →True or false: speed, time and distanceRead the answer and worked solution →The uniform speed exampleRead the answer and worked solution →Order the reasoning: faster means soonerRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Tap every statement true when the DISTANCE is fixedRead 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 →Which is fixed here?Read the answer and worked solution →Flip and pair: fixed quantity with the proportion it createsRead the answer and worked solution →True or false: uniform speedRead the answer and worked solution →Sort each journey statementRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Complete the relationshipRead the answer and worked solution →Journeys at uniform speedRead the answer and worked solution →Which quantity moves, and which way?Read the answer and worked solution →True or false: comparing two journeysRead the answer and worked solution →Order the steps: compare two speeds on one routeRead the answer and worked solution →Assertion and reason: journeysRead the answer and worked solution →Complete the three-way relationshipRead the answer and worked solution →Tap every statement that follows from a fixed routeRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Flip and pair: change and consequenceRead 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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