Q3. The speed of a car is 70 km/hr. It is decreased by 20%. Find the new speed of the car.
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Answer:
Step-by-step explanation:
Distance covered in the first 2 hours = (70 x 2) km = 140 km
Distance covered in the next 2 hours = (80 x 2) km = 160 km
Remaining distance = 345 - (140 + 160) = 45 km Now, speed in the fifth hour = 90 km/hr
∴ Time taken to cover 45 km = (
90
45
)hr=
2
1
hr
∴ Total time taken = (2+2+
2
1
)hr=4
2
1
hrs
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