Question

how long will a boy take to go four times rounds a cicular field whose diameter is 140m walking at a speed of 4km/h

Answer 1

DIAMETER = 140 m
SO , RADIUS =r = 70 m = 0.07km

CIRCUMFERENCE = 2×pie×r
= 2×22÷7×0.07
= 0.44 km
DISTANCE FOR 1 ROUND = 0.44 km

So, DISTANCE COVERED FOR 4 ROUNDS = 4×0.44 =1.76 km

So, SPEED = DISTANCE ÷ TIME

So, TIME = SPEED ÷ TIME

TIME = 4 ÷ 1.76 = 2.27 HOUR

THEREFORE , TIME TAKEN BY BOY TO TRAVEL IS 2.27 HOUR

Answer 2

Answer:

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