128. A car can finish a certain journey in 10 hours at the speed of 42 kmph. In
order to cover the same distance in 7 hours, the speed of the car (1km/h) must be
increased by:
(a) 12
(c) 15
(b) 18
(d) 24
Answers
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1
Answer:
b) 18
Step-by-step explanation:
s = d/t
d = s×t
d = 42 × 10 = 420 km
now for 420 km, S = 420/7 = 60 kmph
so 60-42 = 18 kmph
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