Math, asked by singhharsimran2017, 3 days ago

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

Answered by mettahendre
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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