A car moves from city A to city B on a straight line and then comes back. While moving from A to B, it covers first half of the distance at a rate of 40 km/h and next half with 60 km/h. While moving back from B to A, it moves with 40 km/h for half the time and 60 km/h for remaining half time. Find its average speed and average velocity (i) during its motion from A to B (i) during its motion from B to A.
Answers
Explanation:
CAREER POINT SCHOOL ONLINE
TEXT BOOK EXERCISE
Subject: MATHEMATICS
Class – VIII
Chapter: 8 Percentage and its applications
EXERCISE 8.1
Q 12 Vikram got an increase of 10% in his salary. If the salary after increase was
Rs. 36355, find his salary before increase. Q 14 60% students in a school are boys. Find the total number of students in the
school if 120 are girls. Q 17 On a crossing, when the lights are on( during one cycle ), the vehicles which
cross the green light comprise 50% four wheelers, 35% two wheelers and the rest
three wheelers. If 30 three wheelers cross the light, how many four wheelers and
two wheelers cross during same period?
Q 20 The value of a car depreciates 20% every year. If after two years the price of
a car is Rs. 208000, find its original price. EXERCISE 8.2
Q 8 A shopkeeper bought wheat for Rs. 35000. Due to leakage in the godown 1/7
of the total wheat was spoiled. He sold the good wheat at a gain of 10% and the
spoiled wheat at a loss of 25%. Find his total gain or loss %. Q10 A shopkeeper buys 5 fans for Rs. 4050. He spends Rs. 50 on the
transportation, and sells them at a gain of 15%. Find the selling price of a fan. Q 14 By selling a chair for Rs. 500, Raman loses 10% . For how much should he
sell the chair so as to gain 8%.